According to "Detecto", there are 4 known. But I don't claim that he is an expert. https://www.cointalk.com/threads/1946-silver-nickel.215560/#post-1552161
@rickmp , I dunno. I'm sure you clicked his avatar as I did and saw that he hasn't been on CT since March 20th.
Well, sure he did. It just means that the rest of us will have to do without his posts for the next 999.5 years.
Actually specific gravity is the mass of the material divided by the mass of the same volume of water at that temperature.
But since the density of water is 1 g/cc, they are practically the same. Density is more accurate than specific gravity, but harder to determine, so SG gets used.
Who told you that...weeeeeeeeeeeeell, pretty close, but density changes with temperature, specific gravity doesn't. Just depends on how picky you are.
I'm not sure how that can be true. Nearly everything expands as it gets hotter and shrinks as it gets colder, and not everything does it at the same rate as water.
Hey I have the same nickel a 1946 transitional error silver nickel has been tested to be silver 30% silver what's it worth? edited