You shouldn't melt it. If you sell it on
ebay or a coin dealer as is, they will know it is 90 persent silver and would be happy to buy it from you melt. But if you melt it, it will take time and effort and you will be left with a big lump of silver witch know one other than you would be able to tell what metal and purety it is. Moral of the story is don't melt it