Wow!! An N.R. Davis .410-bore must be as scarce as the teeth of hens! As far as I know, N. R. Davis and its follow on Davis-Warner Arms Corp. never offered a .410-bore double. According to the histories, Davis-Warner Arms Corp. quit producing doubles in 1926, to concentrate on their importing business. Listings from the 1926 E.K. Tryon catalogue --
In 1930, Davis-Warner Arms Corp was sold to Savage Arms Corp. At about the same time Savage Also bought the Crescent Fire Arms Co. from H & D Folsom Arms Co. Savage combined their two Norwich area purchases as Crescent - Davis Arms Corp. and from 1931 to 1935 they struggled to sell some guns, which did include some .410-bores --
By late 1935 Crescent - Davis Arms Corp. was dissolved and the remains moved to Savage's J. Stevens Arms Co. factories at Chicopee Falls, Mass. From 1936 to WW-II J. Stevens Arms Co. listed Crescent-Davis guns in their wholesale price lists behind their lower-priced Springfield Arms Co. line. We see some really unusual combinations of Crescent, Davis and Stevens parts put out during this late 30s, early 40s time period.