I am struggling on some of the items i run accross.Is there anything i can look for other than sterling or 925 on things to determine if they are silver.I struggle with flatware and some trays.Like today i found a very tarninhed tray that looked silver it was stamped onieda silversmith but didnt have sterling or 925 on it....i guess my question is what halmarks should i be looking for,and how much sterling is not marked with sterling or 925...thanx for any ideas jon