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All Forums Category: US Coins and Currency Forums Forum: US Classic and Colonial Coins

Thickness Of Morgan Silver Dollars

 
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Author Previous TopicReplies: 4 / Views: 709Next Topic  
recollector
Valued Member

Canada
77 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?
sel_69l
Bedrock of the Community
Australia
20610 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.
Coinfrog
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Learn More...
United States
75227 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?
sel_69l
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Australia
20610 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
kbbpll
Pillar of the Community
United States
2630 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.
  Previous TopicReplies: 4 / Views: 709Next Topic  
All Forums Category: US Coins and Currency Forums Forum: US Classic and Colonial Coins
 
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