50c kennedy 12,69gr ???

hello, a curiosity for the experts of the half dollar of kennedy, official data say that the weight must be 12.50 grams, but it is possible that it can be found instead to 12.69 grams ??? the spreader bar is perfectly working and calibrated, however I have tried to weigh on other spreader bars and the weight always remains there 12.67 / 12.69. is it normal or what? thanks for the advice

 

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It appears to be within tolerance.

https://www.thesprucecrafts.com/kennedy-half-dollar-specifications-3892146

Weight 1964: 12.50 grams
1965-1970: 11.50 g
1971-Date: 11.34 g
1976 Silver Collector Coins: 11.50 g
1992-Date Silver Proof: 12.50 g

Weight Tolerance (+/-) 1964: 0.259 grams
1965-1970: 0.400 g
1971-Date: 0.454 g
1976 Silver Collector Coins: 0.400 g
1992-Date Silver Proof: 0.400 g

 

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50c 1964 tollerance is from 12,24 to 12,76
i understand, me coin is regular
thankssssssss

 

a technical question to the experts but if a 12,50gr coin contains 0,19gr (12,69) in more they would be 1,5% more in metal, here this metal must be visible in some part in the coin, where in the reliefs? thickness? width? ... well it is an important quantity 1.5% !!! ... maybe a stupid question but I'm not an expert and I'm curious about it. Thank you for your answers

 

The first tests of 1964 are not distinguished from micro die (4) but from more serious things, such as the satin finish of the coin (not glossy), from the narrow and pointed (almost sharp) striped outline but above all from their weight of SILVER non-conforming content to the 12,50gr standard and that brought these very first coins to the destruction and disappearance except for some views in auctions in past years and that confirm precisely their non-standard weight over 12,60gr. Thank you

 

Thickness of the initial blank.
Specific gravity of 900 fine coin silver is 10.34 grams per cubic centimeter. A 12.5 gram blank 3.06 cm in diameter would be 1.64 mm thick.
A blank 1.5% heavier (12.69 grams) would be 1.5% thicker or 1.67 mm thick or about .03 mm or .005 inches thicker than normal. This amount is not going to be visually noticeable.

 

We weighed 11 pieces of 50c Kennedy MS65 and NO ONE exceeded 12.54gr! So something escapes on some early '64 pieces that weigh 12.68gr. THEY ARE EXAMPLES OF SMS OR THEY HAVE NOT BEEN KNOWN TO EXPERTS !!! Thank you

 

Interesting

 

Coin parameters diameter 30.60mm x 2.15 thickness 90% silver 10% copper weight 12.50grams.
The specific weight of 90% silver (10.49kg / m3) is higher than the weight of copper / nickel 10% (8.9kg / m3). In proportion this means that the coins with a weight of 12.68 grams CONTAIN MORE SILVER OF 90% official and exactly are of the 925/1000. It is not known what caused this error in the composition of some batches of 1964 and which contained 925 of silver 75 of copper. Hard to say whether to consider these pieces of SMS or give them another name variant 50C 1964 Kennedy OW (over weight).

 

The answer has already been given. A 1964 Kennedy weighing 12.68 grams is considered to be within normal tolerance, is caused by the strip being slightly thick, and is not considered to be anything special. The reason there is a tolerance specified is because there is a variation in the weights of the planchets. Some are heavy, some are light. I assume the +/- 2% tolerance covers at least 4 standard deviations, assuming planchet weights are normally distributed.

 

The actual tolerance is up to 12.54gr. The one written in the books is fantasy the tolerances in modern gold and silver coins are in the order of 3/1000 thousandths. I invite you to try YOU to weigh your 50c '64 ms65 and you will understand that in reality there are no coins over 12.54gr.

 

Here are the published weights and tolerances for US half dollars (among others). This is from the Coin World Almanac 2011. Reproduced here for educational purposes only. 12.5 grams with .0259 gram tolerance +/-.

 

SERIOUS PUBLICATION ERROR

 

As soon as I get done weighing all of them, not just mine, I'll let you know.

 

all the American 50cents from 1873 to 1964 in silver 900 (12.50gr) have a tolerance of 0.097. Those after 1965 were silver 400 (11.50gr) with a tolerance of 0.400. That table was poorly compiled !!! The 1964 SPECIAL SERIES (sms) coins had 925 silver (12.70gr) and satin finish.

 

When everyone else is wrong and you are right you might want to do a little more research and reflection on the subject at hand.

 

many coins of 1964 were withdrawn and merged precisely because the value of the silver (900AR) contained was higher than the face value 50c. Among these were ERROR pieces that contained precisely (925AR) and weighed about 12,70grams. They were all 30.61d x 12.50 with a tolerance of 0.097. Widening the tolerance to 0.259 to these pieces to justify their excessive weight in some pieces OW only served to hide some unspoken things. Is it possible that nobody noticed this silver weight error ??? No one has ever classified them, how many have survived of these 50c64 OW (over weight)....

 

yes...
I'll ask you a physical question. because the old half dollars before 1964 had a weight tolerance of 0.097 on the 12.50grams and instead the pieces of 1964 should have a crazy tolerance of 0.259 always on the 12.50grams. Same chemical composition for coins 30.61mm 900AG 100CU specific gravity 10.34 graims weight 192.904. Any mathematician, physicist or chemist answers that the tolerance on '64 (0.259) is false !!! or they contain not 900AR but 925AR, and if there are 50c1964 over 12.60grams or are of the FALSE coins or are the special pieces not yet identified the cause. There are no other answers. Do you have any other valid ones ??? ...instead we must ask ourselves how many are the pieces of '64 OW now in the hands of collectors who exchange with the regular 900AR series ???

 

When planchets are made they have specifications as to weight and size. Because of the manufacturing process, the tolerances are needed to be set at a level that makes it cost effective. So not too many are rejected because they are over or under weight. 0.259g is just over a 2% tolerance limit for a 12.50g coin.

They check the tolerances before striking the planchets I would think.

 

Before being stamped, the silver logs are always discarded from the machinery if they exceed 12,50grams, and in any case for what reason do the tolerances on the 50ckennedy rise from 0.097 to 0.259, thus causing a loss on the coin's face value? and indeed they were mostly withdrawn and merged?