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 Replies: 9 / Views: 7,119 |
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Valued Member
United States
125 Posts |
Need help one weighs 11.5 grams the other about 11.0 to 11.1 grams one I I see the copper on the rim edge the other is silver with the diameter is 29.41 instead of 30.6 any idea's   |
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Pillar of the Community
586 Posts |
I'm no expert but if those numbers are correct they sound like they are well within tolerance of actual weight and size. Some coins have gotten a lot more use than others so I think it's safe to chalk it up to normal wear and tear.
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Valued Member
 United States
125 Posts |
I agree but there is no ware and tare from circulations on thses coins
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Pillar of the Community
 United States
7958 Posts |
I am also no expert, but I would be shocked if 4% smaller diameter is within specification for a modern U.S. coin.
Actually that much variation in diameter would be expected to give an even lighter coin (by about 7.5%)all other things being equal.
Likewise, wear does not appear to be a factor here.
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Bedrock of the Community
United States
10982 Posts |
How are you measuring the diameter to 0.01 (10 microns) of a mm (29.41)? The weights are both in tolerance and the coins appear normal.
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Pillar of the Community
United States
7516 Posts |
Quote:
The weights are both in tolerance and the coins appear normal. Exactly. |
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Bedrock of the Community
United States
74770 Posts |
The weight is normal and it's within Mint tolerance.
Errers and Varietys.
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Pillar of the Community
United States
7958 Posts |
I was trying to find a reference on U.S. mint tolerances, and the only citation I could find for the half dollar is that the Weight Tolerance is +/- 0.26 g. http://goccf.com/t/251134As the 1968 half dollar specification was 11.50 g., anything below 11.24 g. would be out of tolerance. So, unless I am using that citation incorrectly, a half at 11.1 g would be out of tolerance. |
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Pillar of the Community
United States
7516 Posts |
Quote:
trying to find a reference on U.S. mint tolerances Weight
1964: 12.50 grams
1965-1970: 11.50 g
1971-Date: 11.34 g
1976 Silver Collector Coins: 11.50 g
1992-Date Silver Proof: 12.50 gWeight Tolerance (+/-)
1964: 0.259 grams
1965-1970: 0.400 g
1971-Date: 0.454 g
1976 Silver Collector Coins: 0.400 g
1992-Date Silver Proof: 0.400 gEdited by Chase007
08/08/2018 3:18 pm
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Pillar of the Community
United States
7958 Posts |
Thank you! And that means I need to take back my comment on the lighter half being out of tolerance. I could not find that level of detail anywhere. It makes perfect sense to me that the Weight Tolerance would need to go up with clad coinage (more sources of variability), but I couldn't find anything other than the earlier 0.26 g figure. |
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Replies: 9 / Views: 7,119 |
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Posted 08/08/2018 08:05 am
