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Thickness Of Morgan Silver Dollars

 
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Author Previous TopicReplies: 4 / Views: 608Next Topic  
Valued Member

Canada
73 Posts
 Posted 10/01/2022  03:37 am Show Profile   Bookmark this topic Add recollector to your friends list Get a Link to this Message
getting out the calipers, I realize my Morgan dollar (1886) is thicker than it should be, like 2.9mm instead of 2.4. graded XF. I bought from a reputable dealer. size and weight check out. I realize that the rim is slightly raised. so the calipers measure the thickness of the rim because the jaws are wide and extend over the rim, not just the body of the coin. question: is the 2.4mm standard for the rim or the body of the coin?
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Australia
20370 Posts
 Posted 10/01/2022  04:18 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
After calculating density of 900 silver at 10.25 g/cc, diameter of 38.1 mm,
average thickness is 2.29mm

It would be reasonable to assume rim thickness is 2.4mm as measured.
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United States
73532 Posts
 Posted 10/01/2022  07:58 am  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Not sure I'm following this - isn't the OP saying the rim thickness is 2.9mm?
Bedrock of the Community
Australia
20370 Posts
 Posted 10/01/2022  09:27 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
If the rim thickness measures 2.9mm, I agree, it is thicker than it should be.
If size and weight check out, and the rim thickness is 2.9mm, it
follows that the metal must be less dense at 8.1 gms/cc
Pillar of the Community
United States
2443 Posts
 Posted 10/01/2022  11:18 am  Show Profile   Bookmark this reply Add kbbpll to your friends list Get a Link to this Reply
Can you post images? My understanding is that some counterfeits make the weight correct by making the coin thicker.
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