Model 12's, unless in 28ga, don't bring what they are truly worth. I think shotgunning has changed a lot and a fixed choke plain barreled 12ga pump in 2 3/4" doesn't fit most folks idea of a "useful" gun. Every time I see one priced like that I'm tempted to buy it. Times have truly changed..
Sad but true, the mdl 12 prices started dropping in 2006 with the prices remaining flat for field guns. The 28 gauge guns and Mdl 42's still bring collector prices for "Clean" unmolested guns. The generation that admired the old guns are dying off, retired from shooting with the new generation wanting a more modern (Designer) looking shotgun or just a 870 Express.
The Winchester Super X model 1 prices are depressed as well considering less than 92,000 were produced.
Doc