The J. Stevens Arms & Tool Co. series of rotary bolted hammerless doubles began circa 1906 with the mono-bloc barrel No. 350 --



and up to the No. 360 and 370 --



Then circa 1909 J. Stevens Arms & Tool Co. switched to chopper lump barrels which they called demi-bloc and the guns became the No. 355 --



No. 365 --



No. 375 --



and No. 385 --