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It's a copy of a Blake & Company $20 gold piece. Only 2 authentic coins of this type and date exist. The piece has little or no value.
220.545
This is clearly a piece of wood that is forcibly submerged since its density would require it to float. So the volume of displaced water should be equal to the volume of the whole piece of wood. Then, density = mass/volume = 62/0.525 g/L = 62/525 g/ml = 0.12 g/ml which is a lot less dense than balsa (0.16 g/ml)!
Mass = 15 gm Volume = 2 cubic cm Density = Mass/Volume = 15/2 = 7 and 1/2 or 7.5 g per cm3
Density = Mass/Volume = 16/2.8 g/mL = 5.714 grams per mL (approx).