Model 11 Shotgun

[Dstanley]

I am attempting to determine the manufacture date and any additional information such as grade/type on a Model 11. The serial number is 390722. The codes stamped on the barrel are BFX. BF would seem to indicate January of 1937 manufacture date, but I can’t find anything regarding the X. The barrel is modified and there appears to be a C stamped on the barrel adjacent to the receiver. There is a duck scene on one side and pheasant on the other. Thanks in advance for any insight anyone my provide!