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 Replies: 13 / Views: 3,819 |
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New Member
United States
5 Posts |
Why do I get some Kennedy's (multiple years, not isolated to a single year) that weigh 11.00g exactly, and another, same mint and look virtually identical weigh 11.35. 1999 is my most recent occurrence. I got two 1967s recently, and they both weigh 11.28, being 40% silver.
My question is: are there certain years (besides '71, '77) and weights to be aware of that could be valuable? Is lighter better? And if heavier is better, what's the minimum? I'm sure some of the fluxuation is due to people messing with the coins, but are there some that happened at the mint?
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Bedrock of the Community
Canada
21600 Posts |
 to the CCF There is a mint tolerance of +- .19 g on business strike quarters that adds to variation. Also wear on a coin can reduce the weight. Being slightly lower or higher in weight does not add any value. |
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Moderator
 United States
56855 Posts |
Edited by John1
09/12/2022 07:47 am
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Bedrock of the Community
United States
62064 Posts |
Nice John1: You used the source to indicate the chart: You get an 'A' today.  Only gold coins are weighed at the mint. The chart will show tolerances that vary from coin to coin. Sometimes they help to identify different compositions of coins. Other times they may indicate an issue with weight, like acid dipped coins, thinned planchets and other issues that are seen in weight differences. Edited by coop
09/12/2022 11:50 am
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Moderator
United States
56855 Posts |
Quote:
Nice John1: You used the source to indicate the chart: You get an 'A' today. Thanks coop  John1  |
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Bedrock of the Community
Canada
21600 Posts |
Thanks for the correction John1, I wrote the tolerance for the quarter instead of the half.
Of course it is .26g for a half dollar.
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Pillar of the Community
United States
1648 Posts |
I agree with the others and welcome. 1971D and 1977D minted on silver blank by mistake 11.5g normal weight for silver, 11.34g for non silver but tolerance needs to be considered. You may find a typical weight for a given year if you weigh enough to know what might be off and with other coins weight may help with figuring out composition as COOP mentioned. ANACS senior numismatist Michael Fahey said graders relied on the 40 percent silver 1971-D coin's specific gravity in making the silver-copper clad determination. The coin's specific gravity is 9.5, close to the standard 9.53 for silver-copper clad, with a weight of 11.44 grams, within tolerance of the U.S. Mint standard 11.5-gram planchet. Normal specific gravity for copper-nickel clad half is 8.92 and a coin's weight is 11.34 grams. https://www.coinworld.com/news/us-c...-silver.html 1977d: https://www.coinworld.com/news/us-c...ver-planchet1976 S 90% silver put into special sets but might possibly show up in change weight will be 11.5g. https://www.PCGS.com/coinfacts/coin...-silver/6728Some info on specific gravity as its not generally discussed much but can be helpful when weight alone does not give all the answers. https://coinsblog.ws/2016/06/detect...gravity.htmlEdited by datadragon
09/12/2022 1:47 pm
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New Member
 United States
5 Posts |
Thank you all for the information and taking the time. What about the underweight coins? 11.34 is the standard, but I've got quite a few that are 11.00 and some others that are 11.05. These fall outside the .19 allowance.
I'm just curious if they're worth my time. I'll post pictures once I figure out how if that helps.
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Moderator
United States
56855 Posts |
It is not .19 it is .26. Circulation wear will reduce weight and if the coin started out a bit light it would be even lighter with the circulation wear loss in weight. John1 |
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Bedrock of the Community
United States
62064 Posts |
Well sometimes the wrong weight (under) might cause a strike to be weaker because of the loss of height. Sometimes the planchets are thinned/pre strike lamination issue, on one side of the coin, thus also showing a weaker strike. So it is more noticed for under weight coins as a weakness in the strikes. But I the only over weight issue that would be a premium would be a 3.11 GR copper planchet on a 1983 cent. Most of the time, we seldom concern ourselves with coin weights. We often use weights to show what composition a coin is? (clads/silver/plated coins) Also wrong stock coins. CoopHome: Do weights mean anything on business strike coins? usually it they are under it is a planchet issue. overweight coins not looked at that often, except for the 3.11 copper 1983 cents instead of zinc cents. Edited by coop
09/14/2022 2:33 pm
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Pillar of the Community
United States
1648 Posts |
It should be mentioned that coins have been found struck on foreign planchets, Next, sometimes planchets for one coin denomination are fed into a coin-stamping press equipped with dies of another denomination. This results in a coin that has been stamped with a design intended for a differently sized coin. Wrong planchet errors may also occur when the composition of the coin changes. Such situations generally arise when the mint has decided to change the alloy or plating of the coin in the new coinage year, but a few planchets from the previous year—and thus of the previous composition—have yet to be struck. Should the dies be changed for the new year while the old planchets are awaiting striking and not removed, coins using the old composition will be struck with the new year's date. While some are rare, weight can be used to help identify these and they do have quite alot of value at times: Here is a partial list: https://varietyerrors.com/wrong-pla...price-guide/Edited by datadragon
09/14/2022 2:44 pm
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Bedrock of the Community
United States
62064 Posts |
https://varietyerrors.com/wrong-pla...price-guide/Well the first coins on that thread is incorrect. It is a normal zinc cent that was given the Texas squeeze and is now wider than normal, but the stretch made the plating fall off of the coin. The weight will be normal. Just an altered coin, not a mint error. I don't see a contact us box. But it is not correct. Just an altered coin, not a coin on a wrong planchet.
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Moderator
United States
95456 Posts |
back to the Kennedy presented - I agree with John1 - just a coin within normal weights.
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Pillar of the Community
United States
1648 Posts |
@Coop, It was just a mention of why weighing coins can be worthwhile in general and also answering the posters question about other coins to look for such as the 64/65 kennedy transitionals and perhaps Kennedys struck on other denominations. There are also varieties but that is another subject. If there is an error in the information on that generic list provided by that website feel free to PM me with the specific one you are referring to and I can provide the email or contact them if you feel its important to do so. I feel its just more important to generally explain the basics like what might be found rather than exact specifics which can be done if someone thinks they found something later.
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Replies: 13 / Views: 3,819 |
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Posted 09/12/2022 07:44 am
