Weight Deviation - Coin Community Forum

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Author	Replies: 5 / Views: 1,286
ky wonder Valued Member United States 61 Posts	Posted 02/06/2012 11:35 pm how much deviation do you see in minted coins of the same denomination? i have weighed some early commemorative halves that I bought over the weekend and I am seeing a good deal of fluctuation, from coins that were all supposed to be minted at 12.5 grams. ranging from 12.49, to as low as 11.4, on clean looking, coins that I would say grade 45-55. also I weighed some clad Kennedy halves and they seem to be in the 11.2 gram range. i am a novice collector and this is the first time I got out a scale to weigh any coins. Report this Post to the Staff

BH1964 Bedrock of the Community United States 10982 Posts	Posted 02/06/2012 11:52 pm 12.5 grams is the nominal weight for 90% silver U.S. half dollars. 40% silver and clad halves will weigh less. 90% silver commem halves should not weigh 11.4 grams in XF/AU condition. That low a weight should only be observed when wear has taken them down to AG/G condition. ANA #R3154474 Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 02/07/2012 12:24 am Half Dollar 1873-1947 192.9 grains +/-1.5 grains Half Dollar 1948-1964 192.9 grains +/-4.0 grains Half Dollar 1965-1970 177.5 grains +/-6.2 grains Half Dollar 1971-2012 175.0 grains +/-7.0 grains source: Guide to Mint Errors 7th Ed. by Alan Herbert Report this Post to the Staff
biggfredd Rest in Peace United States 9104 Posts	Posted 02/07/2012 08:37 am 24 grains to the dwt, 480 to the troy oz. Never weigh coins in grams, it's just confusion. Report this Post to the Staff
just carl Bedrock of the Community United States 20753 Posts	Posted 02/07/2012 08:48 am Several things to remember. 1. Make sure your scale is accurate. By that I mean always check it with something you know the weight of for sure first. Sometimes moving sensitive scales to a new location makes them work different 2. Try using pounds instead since in you'll find much, much less differences. 3. Since your mentioning commemoratives, shouldn't be a difference from wear. So as already noted might be just the + or - tolerances. 4. Possible some are counterfeits? Report this Post to the Staff
biggfredd Rest in Peace United States 9104 Posts	Posted 02/12/2012 05:32 am Quote: Make sure your scale is accurate. Ppl confuse accuracy and precision. Accuracy = how consistently items are weighed against a known standard. Precision = how small a difference in weight the scale can detect. Precision is useless without accuracy. Report this Post to the Staff
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