I'm having trouble finding the mfg. date for a 20 ga. Miroku SxS, Model 351A, S/N 191983, apparently made for Montgomery Ward and lightly stamped "Western Field" on the top of the left barrel. I'd appreciate some advice or information.

It's a nice gun, seems to fit me well, and I enjoy using it. I'm just curious about it's history. I've been told it is very similar to the SxS's they made for Charles Daly. It is NOT a CD! It has BC Miroku engraved all over it, including the butt plate.