Hi All. It's been a while since I've posted. I've been very busy since the Covid situation started and all the repercussions to work, home, relatives, etc. Anyway, I'm trying to get back to important things, such as my coin collection and I came across 2 coins that I'm wondering about. I have a 1967 and a 1968 Half Dollar and they each weigh 11.63 or 11.64 grams. The scale has been calibrated and my other 40% Half Dollars all weigh 11.50 give or take +/-0.04 grams. Isn't 0.13 grams too high an amount to be off? Why would they weigh that much? And if they are counterfeit, how could I tell?
The weight for a 40% Silver Kennedy Half is 11.50 grams +/- 0.400 (11.10 to 11.90 is acceptable). Your 1967 and 1968 Halves are within range.
Ooooppps!! I thought the +/- was .04 I'm sorry all. Please disregard this post! (Darn those zeros - they keep getting into the wrong places! )
Hi. May I ask where these tables came from and whether that source also has tolerances for foreign coins? Thanks.
Answer can be found here - https://www.cointalk.com/threads/i-have-a-question.331678/ As for foreign/world coins, there is no single source for all of them. And what sources there are, they are found in books about the specific coins. And since a great many periods of time are involved no single book covers everything because the weight and fineness tolerances changed sometimes from year to year, other time for decades. That said, if you'd be specific about what you want to know - ask, you may get an answer. edit - I would also add that the situation with world coins can be far more complicated than many would think. This thread gives you some idea of why - https://www.cointalk.com/threads/ancient-medieval-weight-standards-of-old-coins.246389/
As always, thanks for the very thorough responses. And nope, I don't have any foreign coin in particular. Now and then, I come across one that I wonder about, like recently, a 2020 China 30g silver Panda that weighed 28.7g.
If the coins are within acceptable ranges why is it not posted that way? Inquiring minds want to know, thank you.
To be a bit more specific for those who do not know, silver and gold coins have 2 tolerances actually - one for weight and one for fineness.
