well it depends a lot on the condition of the coin -- photo's of course are a must ---since we must see it to judge it.
as far as value goes (how much is it worth) theres a rough book value ( the rough "book" value to a collector of said items -- rarely gotten except in rare cases))-- then theres the what will some one actully give you for it today here and now (real world value --ie pawn broker prices)-- many times -- things are worth as as little as you will take for it --or as much as they will give for it -- a lot of how much a item goes for depends upon who is invovled in "the deal" and just how much the buyer wants the item and just how willing the seller is to part with it .