[RJay]

Montgomery Ward never made firearms, what they did, as other large retaiers such as Sears , Western Auto and others, was to contract with different firearm manufactures to sell their firearms under Montgomery Ward's own Trade Name/Store Brand of Western Field. 15399 is probably the index or stocking number but I can't find it in the crossover list. Your shotgun is more than likely a Stevens or even a Nobel, perhaps some one on the forum can recognize the brand from a clear over all photo.