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<p>[QUOTE="Vess1, post: 24494966, member: 13650"]You need to pick up a simple Red book. You don't need to get one every year, just have a copy for referencing simple stuff like this. I have one in about every room in the house. </p><p><br /></p><p> The 40% halves were in the 1965-1970 range. There were some 1976-S silver clad ones but it says many were melted in 1982. The red book gives you the data for how the composition was split up where the Kennedy half dollar section begins. </p><p><br /></p><p> The 1964s were the last year of the 90% for circulation. For whatever reason they decided to keep a little silver in them for five more years to the tune of 40%. They have 0.1479 troy oz pure silver in them which is in an 80% silver/20% copper outter layer bonded to an inner core of about 21% silver and 79% copper. The end result is a coin that overall is made up of 40% silver. </p><p><br /></p><p> I've read that many bullion dealers are not a fan of 40%ers just because they take up the same size and weight but there's less profit in messing with them while taking the same effort to have them processed.</p><p><br /></p><p> As far as weights are concerned, you're worrying way too much over minor discrepancies that could be anything. Fractions of a gram here is really nothing. You need to be thinking "mass production" </p><p> There aren't people at the mint, perfectly weighing out proportioned amounts of compounds onto scales to ensure every half dollar is 11.500 grams exact. </p><p><br /></p><p> There were huge sheets that I'm sure had tolerance allowances themselves, which had planchets hammered out of them. Every step of the process can cause variances. After coins have been in circulation, a significant amount of the metal can actually wear off the surface until they're mostly slick. Every bit of the wear process in circulation reduces the weight of the coin from when it was released. That alone can be fractions of a gram. Slick coins can be way underweight.[/QUOTE]</p><p><br /></p>
[QUOTE="Vess1, post: 24494966, member: 13650"]You need to pick up a simple Red book. You don't need to get one every year, just have a copy for referencing simple stuff like this. I have one in about every room in the house. The 40% halves were in the 1965-1970 range. There were some 1976-S silver clad ones but it says many were melted in 1982. The red book gives you the data for how the composition was split up where the Kennedy half dollar section begins. The 1964s were the last year of the 90% for circulation. For whatever reason they decided to keep a little silver in them for five more years to the tune of 40%. They have 0.1479 troy oz pure silver in them which is in an 80% silver/20% copper outter layer bonded to an inner core of about 21% silver and 79% copper. The end result is a coin that overall is made up of 40% silver. I've read that many bullion dealers are not a fan of 40%ers just because they take up the same size and weight but there's less profit in messing with them while taking the same effort to have them processed. As far as weights are concerned, you're worrying way too much over minor discrepancies that could be anything. Fractions of a gram here is really nothing. You need to be thinking "mass production" There aren't people at the mint, perfectly weighing out proportioned amounts of compounds onto scales to ensure every half dollar is 11.500 grams exact. There were huge sheets that I'm sure had tolerance allowances themselves, which had planchets hammered out of them. Every step of the process can cause variances. After coins have been in circulation, a significant amount of the metal can actually wear off the surface until they're mostly slick. Every bit of the wear process in circulation reduces the weight of the coin from when it was released. That alone can be fractions of a gram. Slick coins can be way underweight.[/QUOTE]
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Understanding weighing coins is driving me crazy need help
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