I found this quarter while going through some coins, it feels thicker and heavier to me. It does not look plated either. Anyone have any ideas ?
Standard circulating quarters struck in copper-nickel weigh 0.20 oz., or 5.67 gm. Not much heavier. There is sometimes a +/- variance in weight.
Like I mentioned there is a + or - variance for milled coins. Yours could of been milled on a thicker than normal planchet. Referred to as a Rolled Thick Planchet but not by that much.
I'm guessing that the difference falls within the Mint's tolerance. The coin doesn't look unusual to me. Chris
Not necessarily. In my slabbed Quarter it was not determined to be struck on a foreign Planchet. Though I think there might be a few coins struck on Foreign Planchets that could be either to thick or to thin. I've seen examples. Here is the definition of a rolled thick Planchet Definition: Coin metal strip is sometimes rolled too thick. The resulting blanks, and the coins derived from them, are thicker and heavier than normal.
Not that strange. 5.67 plus .227 is 5.897. If you can weigh to three decimals or more that's great, but most people have scales that weight to one or two places and in both of those cases it would round to 5.9
The 40% silver quarters issued for the bicentennial weighed 5.75, although you don't usually see the copper on the edge but many didn't circulate or obtain any wear. Maybe you got lucky OP and found a 1978 struck on a 40% silver planchet that remained stuck somewhere in the mint for a few years.
The only bicentennial quarters that were struck on a 40% silver planchet were supposed to be from the San Francisco mint! That is why someone auctioned their 1978 quarter coin for almost 5,000$ . It was a Denver minted coin, struck on a 40% silver planchet. They don't know how the silver planchet made its way to Denver!
