1982 Penny 3.1 Grams

@John: I look in my papers and mint tolerances. 0.12gr is for Nickels and Quarters for this year..

John me I take only what the Mint publish. You can find this in the Mint Director Reports to the Congress.

I do not have link. I have the hard copies. What I can photocopy, partial is only till 1980 from the begin of the US Mint (like what coins was struck for foreign countries, or No by years and time and facilities, or exact alloys), the rest you can obtain if you have 0 clearance security. If I say the 2.5 deg is the tolerance it is what is permitted now after 1999 fall, and in fact is drive automatically by laser measurement, and happened only when is change the die. the die could not be fix on shaft then in only one position. I think COOP put the video or ANA, of how the Dies are fix now.

I thank you for the link you put, but if you analyze do not keep the sense between the coins tolerances (maybe are the old ones before 1960). Do not forgot that at the Mint you has super bright peoples and very well qualified. I do 'it some projects with them and believe you say half of what you want and they catch and know your meaning. For example in 2020 we test for economical strike of the cent alloy (this testing I can send to you if you want), and the best was cent in Al 203B. was not pass because the line of the production is not for aluminum strike, so the cost to up-grade will be to much and amortization in ten years, so was abandonee because make no sense.

Let me know.

yes John this it is the Law of 1982 for the coins after this date.

PS I like you want to know more and go deep. It is good.

1989 firs time then in 1999. Now in 2020 when the complete new line was up-grade and they have smaller tolerances, but I do not have the results. Just think: no more feeders fingers= replace by bi-ball line= 1 vertical band is feeder and the collar is horizontal band. Second: the roll of the material is polish before cutting the planchet. The cut is done by laser which replace the annealing also and the color differences will be clean during the planchet wash before the strike with boric acid.

PS will will have all the time bigger variations. This it is come from the rolls use and done outside of the Mint. Nothing perfect, me also.