1973 S Clad Proof Kennedy Half Dollar Weighing 11.71 Grams?

1971 to present Kennedy half dollars which are clad should weigh 11.34g and the chart below shows a tolerance of + or - .26g, so it may be slightly over the 11.6g weight. In 1971 all silver was eliminated from the half dollar and replaced with a copper-nickel alloy (clad). However, a different source I have lists the tolerance for the 1973 at 0.454g which would make it within tolerance if that is accurate vs the chart. 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

You are welcome otherwise to upload photos including front, back, and edge as there is always possibilities for rare findings on wrong planchets such as a older silver planchet or plated which adds to weight, but looks like its just within normal fluctuating tolerance levels most likely. For example, a 1971D and 1977D Minted on silver blank by mistake 11.5g for silver, 11.34g for non silver verified by a third party grader ANACS using a different method called specific gravity which are different between the older silver planchets and the later clad ones. https://www.coinworld.com/news/us-c...-silver.html

Secondary reference for Kennedy half tolerance and specific gravity: https://www.thesprucecrafts.com/ken...ions-3892146

The DATA is right. The chart it is just informative. Different years, different sub counteractants, and also different technology change the admitted values of the chart.

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