1980P Half Dollar 11.27g - Over 1 gram light

I pulled another light half dollar this week. It seems to be the same thickness as a normal half, no clips or anything. Normal amount of wear that would not account for it being over 1 gram lighter.
Any thoughts?

 

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Gonna bump this since it has had almost 100 views and no replies

 

I don't know what to say about it

 

Bah! You were the one I was hoping would chime in!

 

All I can think is a defective planket that would cause the underweight.JMO
Dave

 

It has a sound to it that almost sounds like a 40%er. That's what made me notice it to begin with. I'm not sure what the weight would be for a half struck on quarter stock but I think it would be a bit lighter.

 

So I am still intrigued by this coin. I was doing some google searches and came across and article that mentions a 1980P half struck on Susan B. Anthony stock. A SBA should weigh 8.1 grams. Do you think that with the half being larger, that would account for an extra 2 grams?
http://numismaster.com/ta/numis/Article.jsp?ad=article&ArticleId=6003

 

A chart showing what coins would weigh on different stock has it at 10.8 grams.
And halves on quarter stock weigh just under 8.8 grams.

 

So that'd be a no. Hmmm

 

It'd be cool if you found a new variety tho

 

Interesting. I really but know what to say about it, but here are some random observations and thoughts. They may or may not be relevant.

It looks like some areas are not fully struck. Maybe the hair and there is weakness at the 2:00 rim on the obv. and corresponding area on the reverse. My guess would be a rolling error resulted in a thin planchet. It's only 9.4% light so that isn't a huge difference. I don't think it would carry much of a premium. (Don't quote me, but I think the weight spec is +/- 5%. If I'm wrong I know someone will correct me ). Remember, just my thoughts and I wouldn't be surprised if an expert determines it's something else

 

I saw a number of halves on quarter stock and they all weighed
8.79 8.78 8.76 and that doesn't agree with this chart at all.

 

I was leaning towards a rolled thin planchet to begin with. Just happened upon the thing talking about the half on a SBA planchet.
I always forget about SBAs

 

If it was thin, you could stack it with some other halves and it would look thin.
Thin planchet was my first thought but you said it was the same thickness as other halves.
Going back to my previous post, the 9.35 was calculated in error in regards to thickness and the new number is 10.5 grams and the chart says 10.8 grams.
If the chart is correct, including a +/- .15 tolerance, a half on SAB stock would be 10.65 to 10.95.

 

When I get home I will snap a picture of it between some other halves.
That chart confuses me a bit. Perhaps I am a bit too tired still.

 

What confuses me in this chart is how a silver coin could be struck on SBA stock. (Or the other way around.)
The numbers for the halves struck on quarter stock doesn't agree with the slabbed examples at all.

 

Also true. I can only think of sliver proof coins or something along those lines that were minted in the same years as SBAs? Pretty much would only be 1999 right? Seems a bit of a stretch.

 

Somebody probably just made an Excel sheet and did the calculations for all the possibilities without regard to what is possible.

 

Appears to be a rolled thin planchet.

It's not on an SBA planchet, and I doubt
it's on a SBA-thickness half dollar planchet.