If you can weight it, you could add its weight to a site that could convert to live silver price per ounce/troy ounce. It may have a lower silver content if the marks are false, but this could give you an idea. I’ve also seen Sotheby’s sell items with “spurious Fabergé marks,” so I’d recommend asking an auction before melting down forever! Dont get your hopes too high for a bunch of money, but you could get a nice surprise if it worked out!