20 Cent Coin Uniface Planchet Error

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Author	Replies: 9 / Views: 3,522
Australian coin Pillar of the Community Australia 1244 Posts	Posted 06/15/2011 02:13 am http://www.ebay.com.au/itm/20-cent-...em4aabe892d1 Is this real, or has this coin been worn or something Report this Post to the Staff

sel_69l Bedrock of the Community Australia 21788 Posts	Posted 06/15/2011 02:20 am There is absolutely no indication of weight. I can only asume that the obverse has been ground off. I have NEVER heard of the Royal Australian Mint deliberately producing this type of uniface specimen. They would certainly never release it if they did. Report this Post to the Staff
Sap Moderator Australia 16831 Posts	Posted 06/15/2011 04:02 am Yep, the obverse has been machined off. Firstly, It's impossible for a mint to "accidentally" make a uniface coin, so even if it were a genuine uniface coin, it's not an "error". A coin is the product of a blank piece of metal being pressed between two dies. If one of the dies is "missing", then there's nothing for the other die to press against, so no coin can be made - just like you can't clap with only one hand. Uniface patterns are known in the Australian series, but those were made by setting up a special press with a specially prepared blank die. Secondly, this coin - at least, the side that's still there - is quite worn. Somebody surely would have noticed it's state and pulled it from circulation if it had actually left the mint like that. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis Report this Post to the Staff
markn Pillar of the Community Australia 1295 Posts	Posted 06/15/2011 05:00 am Post mint damage. SAP summed it up beautifully. Report this Post to the Staff
Murazor Valued Member Poland 114 Posts	Posted 06/15/2011 08:08 am Quote: A coin is the product of a blank piece of metal being pressed between two dies. If one of the dies is "missing", then there's nothing for the other die to press against, so no coin can be made - just like you can't clap with only one hand. Ommm. And what if two blanks are stuck together one on another? Any examples how the result look like? Back on-topic: the numerous parallel lines on the "blank" back of this coin are a clear sign of what really happened... Report this Post to the Staff
Sap Moderator Australia 16831 Posts	Posted 06/15/2011 09:18 am Quote: And what if two blanks are stuck together one on another? Any examples how the result look like? That generally looks... messy. There'd be twice as much metal between the dies as there should be; it would tend to squirt out all over the place. Since the collar die is only expecting to meet a single thickness coin, the top one would end up not being restrained by the collar and would most probably lie at some crazy angle to the first. And since the ejector mechanism is also expecting a normal-sized coin rather than a double-sized mangled mess, it would probably jam and a "capped die" error would likely be the end result of such manglement if the press kept operating and more blanks kept feeding in. If you somehow carefully managed to get two banks to perfectly line up and managed to get a good clean strike (and such a concoction would surely be deliberate, an idle mint-worker's fantasy piece rather than a genuine "error"), the result would probably be a single "coin", twice as heavy as a normal coin, with the two blanks fused together. I doubt you'd be able to cleanly prise apart the two half-coins without damaging either or both of them, and the result certainly wouldn't look like a nice, neat, "one-sided coin" like we see here. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 06/15/2011 10:47 am LOL, you can even see the grinding marks on the uniface Report this Post to the Staff
biggfredd Rest in Peace United States 9104 Posts	Posted 06/15/2011 6:01 pm Quote: what if two blanks are stuck together one on another? Any examples how the result look like? There would be some imprint thru the blank. ebay "brockage". Report this Post to the Staff
DVCollector Bedrock of the Community United States 10045 Posts	Posted 06/18/2011 10:14 pm "Two hands were clapping" here, and a third hand removed the obverse. Report this Post to the Staff
wesley Valued Member 195 Posts	Posted 06/19/2011 08:02 am banknoteworthy (the seller) should cross his fingers he didn't sell to a person who could land him in court Defacing currency is a crime Report this Post to the Staff
	Replies: 9 / Views: 3,522

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