It seems each new catalog the J. Stevens Arms & Tool Co. issued during the first decade of the Twentieth Century the sidelock hammer doubles changed. In General Catalog No. 50, J. Stevens Arms & Tool Co.'s only double was the No. 250.
By General Catalog No. 51, they had gone to their mono-bloc style of barrel construction and the sidelock doubles were the No. 250 --
No. 260 --
and No. 270 --
By General Catalog No. 52 (circa 1906) they eliminated the underbolts and enlarged the rib extension for a rotary bolt. No. 250 --
No. 260 & 270 --
No. 280 --
Then they changed their method of barrel construction again, going to a chopper lump manner of construction they called Demi-Bloc. and the sidelock doubles became the No. 255 --
and the No. 265 --
The No. 255 and 265 remained the sidelock hammer offerings through the last J. Stevens Arms & Tool Co. catalog. They were gone by the February 1917, J. Stevens Arms Co. revised price list.
