I have found in researching clad layers that the outside layer from certain denominations is usually an average weight. For example, clad dime layers are about .4 grams each side. That means the copper core is 1.47 grams, with a complete clad coin being 2.27 grams. So how can this coin below, which is missing the reverse clad layer and has metal missing on the core, weigh in at 2.08 grams?
I think it depends on where in the process the clad layer splits. The metal sheet is rolled to the specified thickness. If a layer falls off after the sheet is rolled to the final thickness (whether as part of the sheet of after it’s blanked), the weight of the error coin would probably be reasonably consistent. However, if the clad was missing at some point before or during the rolling process, the 2 layers could be close to or equal to the thickness of a normal coin. That could explain why it weighs more
I agree with OH'er's suggestion above. The copper core is probably thicker than the normal finished planchet, Also, take the 2.08 grams on the tag, add the .4 of a gram for the outer layer, and you get 2.48. Normal clad dime planchets should weigh 2.27 which is .21 of a gram difference. With a tolerance of .9 grams (listed in the Redbook), the coin is between .12 and .21 of a gram overweight. Decent, notable, interesting, but not overly significant, imo.
