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1968 d Kennedy half dollar one weighs 11.5 grams then other weigh's 11.1  
 

 
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 Posted 08/08/2018  05:33 am Show Profile   Bookmark this topic Add Mrortiz to your friends list Get a Link to this Message
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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 Posted 08/08/2018  08:01 am  Show Profile   Bookmark this reply Add Waynoah83 to your friends list Get a Link to this Reply
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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 Posted 08/08/2018  08:05 am  Show Profile   Bookmark this reply Add Mrortiz to your friends list Get a Link to this Reply
I agree but there is no ware and tare from circulations on thses coins
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 Posted 08/08/2018  08:10 am  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
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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 Posted 08/08/2018  12:12 pm  Show Profile   Check BH1964's eBay Listings Bookmark this reply Add BH1964 to your friends list Get a Link to this Reply
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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 Posted 08/08/2018  12:17 pm  Show Profile   Bookmark this reply Add Chase007 to your friends list Get a Link to this Reply

Quote:
The weights are both in tolerance and the coins appear normal.


Exactly.
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 Posted 08/08/2018  1:30 pm  Show Profile   Check Errors and Varietys's eBay Listings Bookmark this reply Add Errors and Varietys to your friends list Get a Link to this Reply
The weight is normal and it's within Mint tolerance.
Errors and Varietys, the CCF 911 responder and helper. ;-)
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 Posted 08/08/2018  2:29 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
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/251134

As 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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 Posted 08/08/2018  3:17 pm  Show Profile   Bookmark this reply Add Chase007 to your friends list Get a Link to this Reply

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 g


Weight 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 g
Edited by Chase007
08/08/2018 3:18 pm
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 Posted 08/08/2018  4:05 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
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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