George after Marlin took over in 1945 and started producing guns in 1946 with their prefix of "S" also "FW" becasue that is all that Marlin made was Featherweight frames.
I have a 1946 12 ga Field Grade serial #FW S1826 that doesn't have any thing written on the top of the barrels. On the barrels water table is the serial number and that is was proofed by Marlin because it is the same logo used by Hunter Arms and The L.C. Smith Gun Company, also has Armor Steel on both barrels.
FW S1 was presented to Frank Kenna, the President of Marlin in 1946.
