I was wondering if anyone had any experience with this kind of old shotgun or is familiar with it ? I know what Google says, but would value any first hand experience. It has no brand name, it does not have a gauge marking, I know it’s a 16 because I shot it several times during my youth in the early 70’s. It has matching serial numbers on the forearm, barrel and receiver, but in locations I’ve never seen. Thanks in adavance.