I recently bought a package deal with a brand new Winchester Super X3 and the seller threw in a Stevens 512 Silver Gold Wing which is in PERFECT condition and has I am guessing less then 200 shots through it. I am wondering how much this gun is worth. By the looks of the gun I think I hit the jackpot. I wish I was more familiar with Over/Unders and the best makers. I am more of a semi-auto and pump kind of guy. Never really needed an O/U. Any idea?