Coin Striking Pressures – a Touch Series of Die Adjustment Strikes

20 Cent Die Adjustment Strike

Over on our Facebook page we usually put some coin photos up on a Friday afternoon to get our readers relaxing into the weekend. This week, to take the pressure off the working week we’ve decided to focus on striking pressures in particular weakly struck coins. Then we’ll be moving Fridays photos to a more reader friendly Sunday photos (sorry I know it doesn’t have the same ring -name suggestions invited).

For coins to be made the dies need to strike together at force to transfer those designs into the metal blank surface. It takes between 35 and 200 tonnes of pressure to strike coins and this varies with each coin denomination and if it’s a proof coin or a circulation strike. When the press is setup with new dies a touch series is often made increasing the pressure with each coin struck to decide which tonnage will be used in that production run to make the perfect coin and get the most use out of the dies.

Coins struck with a lower than optimal pressure show poor definition and are labelled die adjustment strikes. This can also happen if there is a press malfunction anytime within the production run, a low pressure strike causing weakness in the coin design. This happens uniformly around the obverse and reverse and is generally the same on both sides of the coin.

To give you some idea of striking pressure it takes 35 tonnes of pressure to strike a $2 coin. It takes 140 tonnes of pressure to strike a larger 50 cent coin. The image below is of a touch series of 20 cent pieces with the weaker strikes (5 tonnes) top left increasing to the stronger strikes (120 tonnes) bottom right.

20 Cent Touch Series. Approx 5 tonnes top left to 120 tonnes bottom right

Posted in Error Coins

2015 ANZACS Remembered 20c Packaging Error

In 2015 the Royal Australian Mint produced a number of collector 20 cent coins that were available to buy when you purchased a newspaper. Collector interest has always been with the limited release red coloured poppy dollar coin issued with the set. But for those with packyboxitis* and an interest in errors here are a couple of mistakes that you need to look out for.

Coin Packaging Error

Recently a collector contacted us about an anomaly in the packaging of one of the 20c coins in the set. Their Royal Australian Navy 20 cent has been sealed into the packaging the wrong way around. It has the Queen’s head or obverse side facing out (see above) and as a result you cannot actually see which coin the packaging holds.

Another error is the wrong coin type in the labelled packaging. The coin pictured below (top) is a Royal Australian Navy coin in the wrong Mateship packaging. The coin below (bottom) is how this packaging should actually appear.

We call this a packaging error as there is nothing specifically wrong with the coin. Of course one must take due care and inspect the packaging closely to see if there is any evidence of tampering if identifying this kind of error.

2015 ANZACS Remembered Packaging Error

There have been a number of packaging errors made at the Mint over the years, a few which appear in the coin catalogues. Probably the most notable is the 1986 mint set with the 1985 dated 10c piece.

Thanks to the coin owners and Blog readers for permission to share.

*packyboxitis is a made up name used in the collecting world for collectors that obtain items because of the way they are packaged. For example the same coin in its packaging might be in a collection twice because it was issued in different packaging.

Posted in Error Coins

Invictus Games Circulating 2 Dollar Coin

2018 Circulating Invictus Games $2 (image courtesy

The Royal Australian Mint (RAM) is today releasing a new $2 coin into circulation. 2.3 million coins will be released into your change or at RAM pop-up shops and coin swaps over the coming months ahead of the Invictus Games to be held in Sydney 20-27 October. Games ambassador HRH Prince Harry and his new wife HRH Duchess Meghan will also be attending the event. Created by the newly married Prince, these Games highlight the healing power of sport inspiring recovery and community understanding for those who have served our country and may be struggling with the effects of their service. The coin celebrates the unconquered spirit of wounded, injured and ill service personnel and veterans across Australia.

Through the healing power of sport the Invictus Games will bring together more than 500 competitors from 18 countries competing in 11 adaptive sports. The coin design depicts an image of a wheelchair competitor sculpted by Aleksandra Stokic. The design also highlights the “I AM” out of the legend Invictus Games in support and encouragement of veteran competitors. The Royal Australian Mint is also producing the Games medals and other collectable coins for the event.

COLLECTORS -this coin is available at RAM coin swap events and travelling roadshows around the country, see our Numismatic Calendar for details.

2018 Invictus Games $2 (image courtesy

Posted in Coin News

Impressive Error Coins For Sale on eBay this Week

If you haven’t checked out eBay for a while then you’re missing some impressive and quality error coins currently selling on that great online garage sale. Even if you’re just a window shopper you should still take a look as these kinds of error coins aren’t seen often.

2016 20 Cent Struck on a Dollar Planchet

Wrong planchet coin errors are not always dramatic to look at but they are when they are struck on the wrong composition planchet. This 20 cent doesn’t appear to have been struck on a cupro-nickel planchet but an aluminium bronze planchet which the seller claims is for a one dollar coin so presumably weighs 9 grams and not 11.31 grams as a 20c should.

View on eBay- 2016 20 Cent Struck on a Dollar Planchet

2000 20 Cent Struck on 10 Cent Planchet PCGS MS64

A stunning lustrous choice uncirculated example of a wrong planchet error. A ten cent coin blank was accidently struck with 20 cent dies and the resulting underweight 20c has been graded by PCGS as MS64 (83914942). A superb error coin with the added assurance of the PCGS slab. This should give buyers confidence to bid on this error coin for sale.

View on eBay- 2000 20 Cent Struck on 10 Cent Planchet PCGS MS64

1994 10 Cent Struck on 5 cent Planchet PCGS MS65

Here we have another wrong planchet similar to the above example, this time an earlier date with the Raphael Maklouf portrait of QEII. This coin graded MS65 (83914941) at PCGS the equivalent to gem uncirculated for those who use adjectival grading terms. If you like a top grade error coin then you should have confidence in this seller.

View on eBay- 1994 10 Cent Struck on 5 cent Planchet PCGS MS65

2016 Decimal Changeover Anniversary Dollar Die Cap Pair

I am amazed at how this error pair left the Mint. What we have in this listing is a matched pair of die caps from the top and bottom dies (hammer and anvil) each planchet having stuck to the dies and struck multiple brockage coins before falling away (at the same time) or the press being stopped and the die caps being forceably removed. In this case the hammer (top) die had to be the more bottle cap shaped obverse and the anvil (bottom) die the reverse 5 kangaroo design. The opposing sides of each coin is flattened (later state) indicating it struck many brockage coins. This commemorative design is a low mintage issue and this error pair so outstanding I might well have to sell a kidney to buy it.

View on eBay- 2016 Decimal Changeover Anniversary Dollar Die Cap Pair

2014 20 Cent Off-Centre Double Strike

Second chance offering with its original buyer failing to complete the transaction, this means it’s back to the bidding with this double struck platypus 20 cent in a new auction. High grade and two visible dates this is a highly desirable error coin. In the case of this double struck coin, the second strike is about 85% off centre.

View on eBay- 2014 20 Cent Off-Centre Double Strike

1974 10 Cent Flipover Double Strike-Indent PCGS MS64

As the seller suggests it is “rare to find” this error, it would certainly be rejected by the mint roll machine! A very nice example for sale on the ‘bay graded by PCGS as MS64 (30336010). Take a look at our flipover double strike article to see another example (the same date too), read about how this occurred and see what the matching coin of this kind of error pair would look like.

View on eBay- 1974 10 Cent Flipover Double Strike-Indent PCGS MS64

Posted in Error Coins

Variety Threepence Spotlight -1925 3d Filled 5, Die Cracks and Clashed Dies

1925 Threepence Variety

The 1925 Australian threepence showcased in this article is much more than your everyday pre-decimal small silver threepenny bit. To variety and error collectors this coin is an interesting study piece so let’s look more closely at its’ features. Evident on this coin is significant die cracking and heavy die clash. Let’s first look at the cracks and broken die. Click on any image to enlarge.

Reverse Die Break and Cracks
As more coins are struck, often through overuse the dies will often crack. This leads them to either shatter or be retired. Evidence of the cracking is always apparent on the struck coin and if a piece of die breaks away then it will leave a cud formed on the coin. In this case the crack has extended from the rim beads through the date and up to the scroll. It has lead to a piece of the die breaking away in the middle of the 5 leaving a cud. We’ll call this (just as in the filled 8 1948 threepence) the filled 5 variety.

1925 Threepence Filled 5 Die Crack

This coin also exhibits a large die crack from the rim to the kangaroo. There is also minor cracking through the legends.

1925 Threepence Die Crack Kangaroo to Rim

Die Clash
This occurs when the obverse and reverse dies hit together at force without a planchet in between them. This leaves the impression of the other die on the surface most of the time visible in the open fields of the coin. We’ve circled and numbered each part of the coin to explain the incuse markings. Our obverse image below shows each point circled (left) and an inverted overlayed reverse (right) showing the details of the clash so you can understand it a little easier.

1925 Threepence Obverse. Right with overlayed inverted reverse to explain die clash

1. Looks like George V is smoking! It is in fact the emu’s front leg that’s up holding the shield.
2. The kangaroos front leg, paw, and the edge of the shield can be seen behind KG’s head.
3. The bottom of the scroll can be seen below the back of the King’s coat.
4. The letters of the date 2 and 5 can be seen inverted, these are easily made out in the fields below the portrait.

5. The incuse curve on the reverse between the date and the scroll is the bottom edge of the King’s portrait.

1925 Threepence Variety -Circled Die Clash

Posted in Error Coins

30th Anniversary of the 2 Dollar Coin

The Original Plaster Cast for the $2 Coin (Steve Keough Photography)

June 20th 2018 is the 30th anniversary of the $2 coin. Australia withdrew the $2 banknote and replaced it with a small size 2 dollar coin on this day in 1988, this change and the introduction of the new coin happened exactly 30 years ago today. The standard design of the Australian $2 coin is an Aboriginal portrait with the Southern Cross and a grass tree. In recent years many commemorative $2 coins have been minted most with added colour printing. Details and mintages can be found on our circulation $2 coins page.

Master Tools for the $2 Coin (Royal Australian Mint Collection)

Posted in Coin News

Remarkable eBay Errors of the Week

There are four pretty remarkable errors up on eBay at the moment. The scarcity of the errors would make them unusual to see in room auctions, let alone the 24 hour mostly-junk-garage-sale that is eBay. Let’s have a look at them

2016 Dollar Coin Struck on 10c Planchet

One of the more unusual wrong planchet errors we’ve seen in the Australian series. A 10c planchet somehow got into the 2016 dollar coin blanks when that year’s mob of roos dollars were being made and was struck with the one dollar design. We’ve seen these type of wrong planchet errors dated 1984, but to see one with such a recent date is very unusual.

View on eBay – 2016 Dollar Coin Struck on 10c Planchet

Double Struck 2014 20c

This is a particularly nice double struck 20 cent. We’ve discussed double struck coins in the past and it’s always nice to see one on a modern decimal coin like this. The second strike appears about 85% offset from the first and almost directly vertically above the first strike. The grade looks excellent too.

View on eBay – 2014 Double Struck 20 Cent

Double Struck 50c 1999-2017

Here’s a double struck denomination you don’t see too often, the 50c. This one is struck the second time about 30% offset from the first strike with the image of the coin showing remnants of the first strike under the second strike. Unfortunately the second strike has obliterated the date but on such an unusual error that doesn’t detract too much. The grade looks good and this would be a key piece of any decimal error collection.

View on eBay – Double Struck 50 Cent (Unknown Date)

Unknown Date 10 Cent struck on a 5 Cent Planchet

The 10 cent on a 5 cent planchet is actually one of the more common wrong planchet decimal errors, but saying that it’s still extremely unusual to see one. This one is more modern than most of the others we’ve seen with the images of the coin showing a date most likely this century as there is just the barest remnant of a 2 visible. The grade looks decent and you’d do worse than to own an error as fine as this one.

View on eBay – 10 Cent on 5 Cent Planchet

Posted in Error Coins

2017 Dollar Master Mintage List

We’ve just finished compiling the master of one dollar coins minted for 2017. The list includes issue prices and accurate mintage information taken from the financial reports of the Royal Australian Mint as well as the expected or capped mintage first advised upon release. Note where there is a zero in the table the number is unlimited or has not been reported yet. The great thing about the list is it is easily searchable, you can type in keywords to narrow down the search for what you might be looking for. The table includes all standard circulation composition Australian 1 dollar coins -25 millimetre, 9 grams in weight and struck in aluminium bronze. Collectors of dollar coins will find this list useful, maybe there’s a coin that’s missing from your collection?

See the 2017 $1 Coins Master Mintage List, it is also found in “The Australian Dollar Coin” drop down header above.

  • 2017 Battle of Beersheba Dollar (image courtesy
Posted in Collecting Coins

Rascals & Ratbags Roadshow -The Mint Tours the Country

2018 Australia’s Convict Era Rascals & Ratbags “Australia” counterstamp dollar (image courtesy

The Royal Australian Mint are on the road again with a travelling roadshow. Visiting Melbourne and sites in Tasmania in May the roadshow will then continue through New South Wales in June. The first leg of the journey visits Melbourne CBD, the Port Arthur historical site, Hobart, Launceston and Devonport. The second leg visits Wagga Wagga, Dubbo, Parramatta, Sydney CBD and Wollongong. For more detailed information see The Australian Numismatic Calendar.

Visitors to these locations will have the opportunity to strike the “Australia” counterstamp onto the 2018 Ratbags and Rascals dollar coin -the coin that acknowledges the contributions of convicts to Australia’s history, heritage and folklore. The Mint will be setting up pop-up shops in each location with the mobile coin press especially for striking the counterstamp onto this coin design by Tony Dean. The theme of ratbags and rascals tells special stories of Australia’s convicts, some that were rascals and some that were ratbags but each contributing to our history. This roadshow is the only way to obtain the commemorative coin with this “Australia” counterstamp.

2018 Australia’s Convict Era Rascals & Ratbags “Australia” counterstamp dollar (image courtesy

At each location the Mint will also be offering coin swaps of the 2018 100 years of ANZAC dollar (10 pack for $10), the Eternal Flame coloured $2 coin (5 pack for $10) and standard circulating designs in sachets by denomination (50c $10, 20c $4, 10c $4, 5c $2). The 50c and 20c, 10c, 5c bags available only in $10 lots -the 20c, 10c and 5c not available individually. There are also limits of 3 purchases per line up.

Latest non-circulating legal tender (NCLT) Mint products will also be available to purchase at the roadshows. Expect to see this national tour travel to Queensland and Western Australia later in the year.

Lest We Forget Eternal Flame Coloured $2 Coin (image courtesy

2018 100 Years of ANZAC Circulating Dollar (image courtesy

Posted in Coin News

Wrong Paint Coloured 2 Dollar Coin Error

2017 Lest We Forget Mosaic $2 With Remembrance Rosemary Colour Error

What’s so special about this coin you say? If you know your coloured $2 coins you’ll see straight away, now pick your bottom lip up off the floor. The coin is a 2017 Lest We Forget coloured $2 which should have multicoloured mosaic painted reverse. Instead, the colour applied to this coin is for the coin released later in the year for Remembrance, the coin featuring green and purple Rosemary flowers. The wrong paint has been applied to the different reverse design coin. See the comparison image below and imagine the paint on the right hand coin has accidentally been applied to the coin on the left -WOW. I struggle to see how this error could be fabricated post-minting and believe this to be a genuine error coin. This is the first coin that has been found with this type of error, are there more out there?

2017 Coloured $2 Coins Left: Lest We Forget Mosaic Right: Remembrance Rosemary (images courtesy

Posted in Error Coins

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Current Coin Values, Bullion Prices and Exchange Rates

AUD $6.91
Australian 1966 Round 50c
AUD $380.41
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Australian $200 Gold Coin
AUD $20.23
Silver Price (per Oz)
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These values are updated hourly using New York market prices. Coin values are purely the value of the gold or silver they contain and do not account for any numismatic value.
Prices Last Updated: 06:04 18 Aug 2018

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