I have a US state quarter that ways 4.9 grams exact and also it's a little bit smaller then a regular quarter would be is this something to look into?
Does it have reeds on the edge? How did you way it... I meant weigh it? I can you post pictures? Both sides?
The Quarter you have shown is PMD - Post Mint Damage.. Some kind of Corrosion due to Environmental Damage.. Not a Mint Error
It is corrosion from environmental damage or possibly high heat then an abrasive cleaning. Whatever happened, it did not leave the mint like that.
For the coin to be light and be an error (thin planchet, wrong stock, etc) it needs to be in good condition. Because then you can see that the light weight is an anomaly. Your coin which looks like it may have seen acid, is junk.
Acid can take a coin's weight down to zero (dissolving it away completely). 4.9g made me wonder about a coin struck on a nickel (5 cent) planchet, but the copper band around the edge shows that isn't true. When a coin has that much surface damage, you can see anything you want in the random patterns.
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I was at the Long Beach Expo last week, so I'm late to the party. It's badly damaged, and not an error coin of any type, I'm sorry to say (and add to other's comments)
Yes it is damaged, but beating it to death wouldn't reduced the weight. Soaking it in corrosives would reduce the weight, but that typically gives you the "Oreo cookie" effect on the edge (especially with that much weight reduction) which isn't present here. This may have actually been a rolled thin planchet that has been beaten to death. (making it worth effectively 25 cents, a destroyed error coin)
