I came across a few coins from Mauritius and Seychelles that were minted in the very same year with different Fineness of silver. It is almost impossible to identify the difference except for a few grams difference in weight.
1.Mauritius -25 Rupees -1977
Fineness can be 92.5 or 50%
The only way to differentiate is by weight.
Coin with Fineness of 92.5% weighs: 28.28 Gms
Coin with Fineness of 50% weighs: 28.4 Gms
The very same coin with distinct fineness.
One other coin is the 1981 Seychelles 100 Rupees.
Fineness can be 92.5 or 50%
Coin with Fineness of 92.5% weighs: 31.65 Gms
Coin with Fineness of 50% weighs: 35 Gms
Just watch carefully while bidding on EBay. It truly matters the seller you are buying from. Some sellers might list these without understanding as to actual fineness of these coins.
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