The Sterlingworth Company catalogue of 1910 offers the gun in two versions.
Sterlingworth "Standard" Gun -- 12 gauge only; 30" barrels only; weight, 7 1/2 to 7 3/4 lbs. only; both barrels full choke; drop 2 3/4"; length of stock 14"; stock of American walnut, with full cap pistol grip. Patent snap forend; hard rubber butt plate; Sterlingworth Fluid Compressed Steel Barrels. Net Price.................$25.00
Sterlingworth "Field" Gun -- Same as the Sterlingworth "Standard," except 28" barrel; right barrel modified, left barrel full choke; weight 7 lbs.; drop 2 7/8". Net Price...........................$25.00
When the Sterlingworth appeared in the 1911 A.H. Fox Gun Co. "Campfire" catalogue they added the "Brush" with 26" barrels, and ejectors were offered --
In the 1912 A.H. Fox Gun Co. "Campfire" catalogue the 16- and 20-gauges were added.
In the 1913 A.H. Fox Gun Co. "A Fox Gets the Game" catalogue the "Trap" with 32" barrels were added to the offerings.
As far as recessed hinge pin heads goes, several of the J. Stevens Arms & Tool Co. doubles had them as did a number of early Lefevers and N.R. Davis Guns. Ansley H. Fox seemed to like them as his Fox Gun Co. Balto., Md., U.S.A. guns had them --
as did hid Philadelphia Arms Co. Fox doubles --
