I tried to find that 15KX, but it doesnt seem to exist. Could this gun possibly be a bolt action shotgun with a clip? If so, its very possible that its a Western Field 151X and the number 1 looks like a "K". The Western Field 151X was made by Kessler Arms in Silver Creek, NY. The shotgun was only made from 1951 to 1953. The Gun Parts Corporation in Hurley NY may have parts and more information for you.
Various other websites list this as a Western Field brand sold at Montgomery Wards but manufactured by Mossberg (hence the M in the model number). The Mossberg model number is 402
Your .22cal bolt action rifle was made by mossberg.The model number is mossberg model 45A.
The westernfield model 850 was made by mossberg for Montgomery wards.The mossberg model number was mossberg model 353.I would start with mossberg and go from there.
It was made from 1937-1938.It was made by Mossberg,and the model number was Mossberg model 45A.
Your western field model 550AD was made by mossberg for montgomery wards.These shotguns were the same model number for mossberg ,as for montgomery wards.
Mossberg Model 340.
Your westernfield model M780 was made by mossberg.The mossberg model number is mossberg model 800A.
Contact Mossberg Customer Service through their website. That rifle was made by Mossberg for Montgomery Wards. It is a Mossberg Model 742.
Western Field 48A was made for Montgomery Wards by Mossberg. The model 48A is a Mossberg 45B .22 caliber Long Rifle
The western field model 172B was made for Montgomery Wards(Western Field) by the firm Mossberg and sons.The Mossberg model 395K and your shotgun are one and the same.The Mossberg model 395K was made from 1963-1983.
Your western field model m550a was made by mossberg.There model number is the mossberg model 500.
I can supply half the answer (the easy half) Mossberg made this firearm as with most Western Field firearms.It was the Mossberg model 800A and was made from 1967-1972.