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 Replies: 14 / Views: 1,447 |
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Pillar of the Community
United States
3330 Posts |
This cent is  Thickness: 1.35 mm - spec is 1.55 mm Diameter: 19.25 mm - spec is 19 mm Weight: 2.94 g - spec is 3.11 g with tolerance of +/-0.013 g Anyone have any explanations or comments? What would this be called?   |
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Moderator
 United States
56855 Posts |
96 years of being circulated? John1  |
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Bedrock of the Community
United States
12437 Posts |
There is no spec for the thickness of a struck coin, only the planchet. The thickness of a struck coin is dependent on where exactly the thickness is being measured so it is a non-standard measurement. Long-term circulation can flatten out the rims and decrease the overall weight of the coin.
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Bedrock of the Community
United States
10982 Posts |
All items are within reasonable tolerances and as biokemist noted thickness do es not apply. A diameter 0.25mm (0.010") high is likely a caliper and measurement mistake.
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Pillar of the Community
 United States
3330 Posts |
Quote:
A diameter 0.25mm (0.010") high is likely a caliper and measurement mistake. Not likely! I use a precision instrument for measuring. Granted, it is an antique - early 20th century - created for the precision measurement of watch parts. It is not off more than 0.004 to 0.005 mm and that adjustment is simple to make on the read out. The way I noticed this coin is that the diameter was oversize enough to become stuck in a plastic coin tube.  |
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Moderator
United States
56855 Posts |
I like that tool. What year was it made? John1 |
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Pillar of the Community
United States
3330 Posts |
1930s I think. I see them offered on ebay from time to time. |
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Bedrock of the Community
United States
17884 Posts |
Your Weight Tolerance is off, tolerance is +/- .13 grams not .013 So new it could have been 2.98 grams with the heavy wear a loss of .04 grams does not seem unlikely. Is the diameter reading consistent all the way around the coin? |
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Pillar of the Community
United States
3330 Posts |
Quote:
Is the diameter reading consistent all the way around the coin? Yes it is at least within 0.01 mm. |
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Pillar of the Community
United States
3330 Posts |
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Bedrock of the Community
United States
10982 Posts |
Have you checked other cents for diameter and used them as a comparison? Is there any contamination on the one you are measuring? Many things could account for 1/100" large diameter including mint tolerance or being stuck with a hammer. The weight is fine and well within tolerance for a worn Lincoln Cent. Coins lose weight in circulation and yours appears completely normal. |
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Bedrock of the Community
United States
12437 Posts |
Quote:
It lists tolerance of 0.13 g only for 1943 Cents and 0.013 g for all other Wheat Cents. I have found about.com to typically be riddled with inaccuracies, the tolerance for all Lincolns is +/-2 grains(0.13 grams). I use tolerances listed in Alan Herbert's Official Price Guide to Mint Errors. |
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Pillar of the Community
United States
3330 Posts |
Thank you.  |
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Bedrock of the Community
United States
17884 Posts |
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Pillar of the Community
United States
3330 Posts |
Thanks! |
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Replies: 14 / Views: 1,447 |
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Posted 01/14/2016 4:55 pm
