are you sure it's a ruger ,,and not a luger pistol? if it's a luger it may be pretty valuable ,,what does it say on top of the gun ,,any markings or names ,,any chance of getting a pic of it ,,let us know and we can help ya with a value,,i'm including a pic of a luger so if ya don't know for sure ..see if this looks like your pistol..
bigcurt