Anyone ever see a Winchester Model 97 without a serial #? A local auction had a listing where the gun was advertised as without a serial # and had excellent pictures. It was old but clearly marked Winchester 97 with the very small forearm. The oldest I had ever owned was a solid frame "C" model 97 but even it had a serial #. Left me puzzled as there was no serial number on this shotgun? Winchester experts chime in please!