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1965 Kennedy Half Dollar 90% Silver Error, Asking Best Place To Authenticat

 
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Author Previous TopicReplies: 9 / Views: 377Next Topic  
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Canada
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 Posted 10/08/2020  08:44 am Show Profile   Bookmark this topic Add Leonitus1916 to your friends list Get a Link to this Message
Notice beside another 1965 that its completely grey. I performed a specific gravity test as well and got 10.3 and 10.5 is the specific gravity for the 90% silver pieces. In not saying my gravity test could be wrong, sure there's room for error but I've tested it with other known silver pieces and got the right numbers. Where do I go from here guys? Any help is appreciated


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United States
2545 Posts
 Posted 10/08/2020  08:52 am  Show Profile   Check Yokozuna's eBay Listings Bookmark this reply Add Yokozuna to your friends list Get a Link to this Reply
Do you have the weight of the coin? The weight should tell you if it's 90% silver or 40% silver. A 90% silver Kennedy should weigh 12.5 grams and the 40% should be 1 gram less at 11.5 grams.
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 Posted 10/08/2020  09:00 am  Show Profile   Bookmark this reply Add Ty2020b to your friends list Get a Link to this Reply
there's a big enough gap in weight between the two to help give a pretty definitive answer.
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 Posted 10/08/2020  09:47 am  Show Profile   Bookmark this reply Add Badger Mint to your friends list Get a Link to this Reply
In your edge picture, which one is the 1965?
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 Posted 10/08/2020  10:50 am  Show Profile   Check BigSilver's eBay Listings Bookmark this reply Add BigSilver to your friends list Get a Link to this Reply
weight is needed here. Edge is not a reliable way to determine 90 vs 40. I've seen plenty of very clean white edges on 40%ers
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 Posted 10/08/2020  11:32 am  Show Profile   Bookmark this reply Add ijn1944 to your friends list Get a Link to this Reply
Yes, I've seen white edges on many, many 40% Kennedy halves. Eager to learn the weight.
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Canada
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 Posted 10/08/2020  11:56 am  Show Profile   Bookmark this reply Add Leonitus1916 to your friends list Get a Link to this Reply
Both the coins are 1965, the weight is an issue I thought of too it comes up at 11.4 for dry weight and 1.1 for wet weight which gives 10.3 which is Shy of the 90% silver specific gravity weight of 10.5
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Canada
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 Posted 10/08/2020  11:59 am  Show Profile   Bookmark this reply Add Leonitus1916 to your friends list Get a Link to this Reply
It might be like the 1971-d 40% silver planchet error that was 11.3 g which is the normal weight for copper clad
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 Posted 10/08/2020  2:09 pm  Show Profile   Check nss-52's eBay Listings Bookmark this reply Add nss-52 to your friends list Get a Link to this Reply
If it weighs 11.4 grams, then it is not 90% silver.
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 Posted 10/08/2020  2:23 pm  Show Profile   Bookmark this reply Add Big-Kingdom to your friends list Get a Link to this Reply
No idea what you are doing or why, the coin weighs 11.4g right?

40%er is 11.500g with a tolerance of +/- 0.400 grams
90%er is 12.500g with a tolerance of +/- 0.259g
clad is 11.340g with a tolerance of +/- 0.454g

1. what are you trying to prove, that it's a 90% 1965? it's underweight by more than a gram if it is and the 90% had the tightest tolerances.

2. if it's 40%,it's only 0.1g light and could be circulation wear, couldn't it be a little lighter than that even and then it was plated with silver or another metal, maybe platinum even to explain the color? People plate everything and have for years now.

My opinion, it's been plated. and this is also what's throwing off youf SG readings for the additional plating you aren't accounting for.
Edited by Big-Kingdom
10/08/2020 2:24 pm
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