Benjamin Mdl 312, 342,and 392

[Tuck2222]

I have two model 312  rifles  made in St. Louis Mo. One has 312 stamped in the rear end of the action the other on the side of the action.  What year was the change made?   There are no serial numbers on the rifles.  My model 342 was made in Racine ,Wis .  but were the first ones made in St. Louis ? What year did Benjamin move from St. Louis , Mo to Racine ,Wis ?  When and where were the first 392 models  made ?  About fours years ago I started collecting and repairing pump up air rifles so there is a lot I don't know about my new hobby.

[Tuck2222]

I have found that the Benjamin 392 pump up air rifles made by Crosman  NY state made a Phase 1 1995- 1997, Phase 2 1997-2006, and Phase 4 2007 to Present. Crosman Corp purchased Benjamin Sheridan  located Racine , Wis in 1992 and moved the equipment to N Y state. Previous to that Benjamin located in St Louis, MO purchased Sheridan and moved to Racine, Wis. I have yet to find what calibers and models were made in Racine Wis beside the 20 Cal Blue Streak and the 22 Cal Benjamin 342 if any.