N.R. Davis & Sons was in Freetown and later Assonet, Mass. They were acquired by Warner Arms Corp. of Norwich, Conn. in 1917, and the business became Davis Warner Arms Corp. According to the late Joe Vorisek, evidence suggests that parts were made at Assonet as late as 1925, but that they were assembled into guns at the Warner factory in Norwich. Here is a 20-gauge with a real hodge-podge of markings. It is marked "N.R. Davis & Sons", but "Davis Warner Arms Co." and then the real kicker "Chicopee Falls, Mass." the address of the J. Stevens Arms Co. factories?!?
One would think that if anything, a gun with the Chicopee Falls address would be marked either Crescent - Davis Arms Corp. or J. Stevens Arms Co.???
Note that the Davis Warner Arms Corp. era Davis guns in the 1926 E.K. Tryon catalogue (above) have a straight back to their receivers, like the .410-bore pictured in the Gunsamerica ad. The ones in the Crescent - Davis Arms Corp. catalogue have the curved back to the receiver as the 20-gauge gun I've pictured here?!?