Seeking info on the fine points of the venerable Winchester Model 12. Long story short: I'm reasonably knowledgeable about shotguns in general and used to collect antique guns. Hunted with a friend and his father for years--ducks, pheasants, quail, etc. in the Midwest. Friend's father had an old Model 12, 16 ga. I used it on occasion. Lately, I've been keeping an eye out for one, preferably a 20 ga. I know about original condition, and the general check list of what to look for. However, one can always learn more--especially when contemplating laying out a bunch of cash for a legendary gun that might have had some help in being rebuilt or jazzed up to get a better price. I'm not interested in a 12 ga, loads of them around, most are trashed. Book says although over 2 million were made the attrition rate is over 33% from hard use and getting lost. A week ago I came across a sweet 20 ga Model 12. Blue is original, approx. 90% plus. Crisp action. Stock MAY have been refinished (well done) with no sanding based on the wood/metal fit. Great bore. Owner says mfg. date is 1931. No vent rib, barrel appears to be standard 28", 2 3/4" chamber, full choke. Serial number on loading tube and front underside of receiver match. Clear stamps and proofs. I don't think this shotgun was used much. The price is $500 which seemed pretty reasonable based on book values. He's not a dealer, but does buy and sell guns. Question to the online wisdom bank: What am I missing? Comments and opinions very welcome. Thanks.