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<p>[QUOTE=&quot;msungs, post: 1084581, member: 28882&quot;]I am investing in 1964 Silver Half Kennedy&#039;s and Franklin Half Dollars.&nbsp; I found someone online (coin collector on answers.com) that says the total tolerance of the Half Dollars +/- is 0.259.&nbsp; The Silver halves should weigh 12.50g according to the US Mint.&nbsp; The majority of mine weigh between 12.45-12.55 grams (well within any tolerance level).&nbsp; I do have about five though that weigh as little as 12.30 or as high as 12.67.&nbsp; When you do the math that is a difference of 1.6% deviation on the low end and 1.3% on the high end.&nbsp; I have seen an article at about.com that says that anything under or over 1% is not considered an authentic coin.&nbsp; I have seen another post where people said to look up the weight tolerance levels in a coin collecting book like Coin World Almanac.&nbsp; The coins are all circulated and to me it makes sense that some of the coins would lose some of their metal content through friction and everyday use.&nbsp; I have an old silver quarter that comes in at 5.5 grams (the day it was struck it should have been 6.25 grams).&nbsp; My question is does anybody know where I can find the standard tolerance levels prescribed by the US Mint and give me your general opinion do you think my coins are authentic?&nbsp; The size is nearly perfect (I measured it with calipers, it looks like silver, feels like silver, and the ping test sounds like silver) it is just the weight.&nbsp; It bothers me a little bit.[/QUOTE]</p><p><br /></p>

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