New Discovery and UNIQUE: Proof Great Britain 1967 Sixpence
Recently turned up is this now-certified GB 1967 Record Proof Sixpence. Not known or recorded, it allegedly turned up in a 1970 proof set with all other coins in the set of normal type.
Highly unusual, what would it reach at auction if publicised? Yikes.

Well, just Love coins, period.
Comments
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A 1967 coin was found in a 1970 proof set? Seems strange and almost impossible.
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More to the story…
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Yes, I would suspect. Verrrrry strange. I looked at my 1970 proof set and, well, NO special 6d or other coin.....
This coin is right up my alley and have never heard of ANY 1967 Record proofs "in the wild" under any circumstances.
Love that Milled British (1830-1960)
Well, just Love coins, period.2 -
LOL, here is the USD 2.00 version versus the many thousands of the OP::

Love that Milled British (1830-1960)
Well, just Love coins, period.0 -
Interesting coin.
I try to use the term "unique" sparingly and usually qualify it as "probably unique." I have learned the hard way that the Royal Mint made many treasures for many people at many different points in time, including post-dated treasures and restrikes.
Numismatic author & owner of the Uncommon Cents collections. 2011 and 2025 Fred Bowman Literary Award, 2025 Guy Potter Literary Award, 2022 Paul Fiocca Award, & 2020 J. Douglas Ferguson Award.
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@bosox said:
Interesting coin.I try to use the term "unique" sparingly and usually qualify it as "probably unique." I have learned the hard way that the Royal Mint made many treasures for many people at many different points in time, including post-dated treasures and restrikes.
Agreed. But it is odd that such a special thing would end up in a seemingly-normal proof set.
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As do I. I think this one may have gotten out by accident as the 1970 proof set it was in was supposedly quite ordinary and was not made to special order. Also, the coin unknown for now basically 60 years.
Love that Milled British (1830-1960)
Well, just Love coins, period.1 -
Very cool. FWIW, I would guess it would bring about $5000 at auction.
Andy Lustig
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.2 -
Maybe it started as a Proof of the frozen 1967 date ahead of the issuance of the 1970 proof sets proper, and someone mixed it up with the 1970 coins by mistake
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Could be except that I don’t think any other 1967 proofs are known. I tried looking at Royal Mint collection and couldn’t not find it or any others of that date.
Love that Milled British (1830-1960)
Well, just Love coins, period.0 -
67 business strikes apparently aren’t known either.
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Nice coin 🪙
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Strange… one can not help wonder if lightning will strike twice. Seems plausible there could be others. But why would one surface so much later. This could even be more mysterious than the 1971-s type I proof which may have a known population of 25-40… if that.
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Umm, business strikes not known? LOL, okay then.......I'll trade you a biz strike for this one!
Love that Milled British (1830-1960)
Well, just Love coins, period.1 -
@7Jaguars said:
Could be except that I don’t think any other 1967 proofs are known. I tried looking at Royal Mint collection and couldn’t not find it or any others of that date.Quite a few coins in the Royal mint collection are most likely proof or at least specimen but are being described as currency, for the sixpence Im not sure there's one who could be a low-quality proof or just a well struck curency strike but for a few others (florin, threepence, halfpenny) Im quite confident the mint is holding proofs.
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Pictures of actual coin. I do not see hairlines or marks and wonder at the Proof 64 designation, though it is not cameo. Spots not on obverse of coin


Love that Milled British (1830-1960)
Well, just Love coins, period.3 -
Truly amazing how one person consistently discovers examples otherwise unknown to numismatics. That is very much a gift and i’m sure requires a high level of dedication

Highly enthusiastic about world coins, contemporary circulating counterfeits and unusual stuff
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I wonder if the Royal Mint has an opinion and/ or explanation for this production and packaging oddity? Peace Roy
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@WorldCoinsDmitry said:
Truly amazing how one person consistently discovers examples otherwise unknown to numismatics. That is very much a gift and i’m sure requires a high level of dedication
LOL, well as I get older and my funds dwindle relatively - this would be sad but if anything INCREASE my alertness and what I like to think of as dedication. I have had to keep my fields of interest somewhat focused whilst admitting to surrendering to the occasional temptation.
I love the spirit of what I regard as a numismatist and hope to continue on.
Thanks!Love that Milled British (1830-1960)
Well, just Love coins, period.2 -
@Namvet69 said:
I wonder if the Royal Mint has an opinion and/ or explanation for this production and packaging oddity? Peace Royit doesn't quite have the look of any other proof of records on previous years (including the 1967 in the Royal mint collection) . My guess would be a 1970 obv die paired by accident with a 1967 reverse and the coin was struck in 1970
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Perhaps but interestingly very similar to the Record proof 1966 GB English Reverse shilling that I have. One could only guess that a "spare" 1967 coin was lying around for 3 years before landing in a 190 set, but think as you said. I would have expected more to turn up in the last 56 years, but not the case.
Love that Milled British (1830-1960)
Well, just Love coins, period.0
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