1969 Kennedy Half Dollar Planchet Error??

You are saying different things here.
First you say the core is an alloy. Which it is.
And then you say it is a copper core, which it is not. And again you say the core is alloyed, which it is.
A copper core is copper. Cut open a new half dollar and look inside.
A 40% silver half from 1965-1970 does not have a copper core even though
the alloy is 79% copper.

 

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According to my count, I mentioned the copper core with regard to the Kennedy Silver Clad Composition 3 times, and in each case I specified its composition as including a specific % silver. Your point is well taken: I should have said "copper alloy core". I mentioned a copper core generally without specifying composition only to indicate - and quote experts who so indicate - that cladding can be pulled over the core by a dull punch. I assumed that anyone reading those comments would understand that they were meant to include cladding of any of the clad compositions of existing coins and a core of any composition (100% copper or a copper alloy) of existing coins. I assumed that a general reference without specifying composition detail would be understandable by those reading the comments. I certainly understood the reference when it was made by the experts I quoted.

You are correct that I did not say "Copper Alloy Core" and I did not feel it necessary to explain in each mention that a percentage mixture as I stated was, in fact an alloy. My apologies for that oversight - I certainly assumed anyone reading my comments would understand that.

I also apologize that I made an assumption about the statement from those who were insisting I was wrong about the coin in the OP being silver clad because it was instead 40% silver. I assumed they were saying that the coin was a monolithic cuprosilver alloy composed of 40% silver and the remaining % was copper.

 

Did you ever find out about your coin that weighs 12g? I have a 1965 Kennedy half dollar that also weighs 12g and I am curious to learn more about it.

 

Welcome to Coin Talk. You need to weigh your coin on a scale that reads in 10ths, or better yet, 100ths of a gram. As noted by @Pete Apple there's a +/ .4 gram weight tolerance for the 1965 Kennedy half. If your scale only gives weights in full grams, a coin weighing 11.8 or 11.9 grams will probably show up as 12 grams. There's also such a thing called rolled thick and rolled thin planchets. So even if your coin weighed a full 12 grams, it could be explained by that. See the following: http://www.error-ref.com/rolled-thick-planchets/

 

I have the same 1969 d half dollar Kennedy it is all silver even on the edges, my 1969 d Kennedy dollar the rims have been worn off which caused a weight drop. So the only true way to figure this out is figure out how much weight you would lose if their rims was worn off.

 

Got Pics? That way we can assess the coin.

 

This thread is 6 years old. Please start a new thread and post full sized photos of both sides and the edge.

 

Yea, why bring back old memories. Heck! I wasn't even here then.