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 Replies: 18 / Views: 3,061 |
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Pillar of the Community
United States
3331 Posts |
Edited by Pete2226
08/19/2019 2:58 pm
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Pillar of the Community
United States
1543 Posts |
George might need a new barber.
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Bedrock of the Community
United States
74931 Posts |
Very interesting error coin!
Errers and Varietys.
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Pillar of the Community
 United States
3331 Posts |
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Pillar of the Community
United States
3331 Posts |
I have to laugh at the name Mike Diamond gives to this error:
"Frosting Slops Over the Edge of the Design Element"
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Pillar of the Community
United States
1070 Posts |
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Rest in Peace
United States
17900 Posts |
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Bedrock of the Community
United States
17884 Posts |
In 1969 the proof coins were not deliberately "frosted" so it was not "applied" back then so the chance that it is a "frost slopped over" is pretty much zero. Cameo or deep cameo proofs are rather unusual back then and the command a premium. There are coin doctors out there that will artificially frost proof coins and the frost spilling over into areas where it doesn't belong is one way of spotting them. I would find this "error" questionable.
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Pillar of the Community
United States
3331 Posts |
Quote:
In 1969 the proof coins were not deliberately "frosted" so it was not "applied" back then so the chance that it is a "frost slopped over" is pretty much zero. Cameo or deep cameo proofs are rather unusual back then and the command a premium. There are coin doctors out there that will artificially frost proof coins and the frost spilling over into areas where it doesn't belong is one way of spotting them. I would find this "error" questionable. Thank you Conder101! Your comments sent me scrambling for more information. I found this article by Charles Morgan (editor of Coin Week) about the 1969 Proof set.I would appreciate hearing your thoughts about it: Quote:Again, its key to remember that the techniques employed by the United States Mint to strike Proofs in 1969 produced coins that more consistently exhibited frosted devices, but the quality of these cameos varies dramatically and it's not unusual to find sets that are comprised of coins that are brilliant, cameo'ed, or borderline. https://coinweek.com/modern-coins/w...f-set-worth/ |
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Bedrock of the Community
United States
94367 Posts |
Thanks for clearing that up, Conder.
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Pillar of the Community
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3331 Posts |
I also found the following reference. It sounds like frosting was around before 1971. Interested in additional information anyone can provide. Quote:The cameo affect on a proof coin is produced by the field having a mirror-like surface and the coin's devices having a frosted surface. Proof coins minted before 1971 were made using a technique so that only the first hundred coins had a cameo contrast effect. If there is a dramatic contrast between the field and the devices, this is referred to as deep cameo. https://www.thesprucecrafts.com/cam...ition-768528 |
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Bedrock of the Community
United States
17884 Posts |
The "technique" for the frost on the proofs before 73 was pretty much just this, the dies would be hardened and then cleaned of oxides in an mild acid bath, The acid bath would also very lightly etch the surfaces. Then the fields would be polished to the mirror finish. The devices were not polished and no further treatment was don to them to strengthen the "frost". So the cameo contrast came solely from that light acid bath etching.(hence the reason wy the 1969 proof quarter would not show frost "slopping over") That light etching did not survive long once the dies were put into use. The deep cameos were simply the result of a slightly stronger etching.
Later when they decided to deliberately frost the dies for contrast they would polish the dies. mask off the fields and then sandblast the die face. That resulted in a much stronger longer lasting contrast. Today the use computer controled lasers to etch the devices. If the computer malfunctions or the die is not placed exactly right the frost can run into areas where it is not supposed to be, or in some cases the laser is set to make two passes to selectively make some areas more highly frosted than others.
Edited by Conder101
08/20/2019 2:34 pm
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Pillar of the Community
United States
3331 Posts |
Thank you Conder 101.
So I think you are saying that the polishing of the fields of the die after an acid bath is unlikely, if not impossible, to leave a smear such as is on this coin.
Therefore, this coin most likely had the frost artificially applied after minting and in the process some of the frost spilled over into the area I have circled on this coin, thus providing a helpful diagnostic in identifying a doctored coin.
Now I understand!
THANK YOU!
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Bedrock of the Community
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62064 Posts |
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Pillar of the Community
United States
3331 Posts |
After checking values, I am thinking the Coin Doctors would be trying to produce very high grade Deep Cameo coins (PR 69DCAM) which would command a substantial premium.
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Pillar of the Community
United States
3331 Posts |
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Replies: 18 / Views: 3,061 |
Posted 08/19/2019 3:08 pm
