Ansley H. Fox Gun Co. graded guns A- to FE-grade had a smooth profile from the beginning in 1905. Here is an early 2-digit serial number gun from the Wayne & Bristol Streets days (1905-06) --
18 01 A-Grade.jpg
Only the first 12000 or so 12-gauge Sterlingworths had the recessed hinge pin. In 1910 they were marketed under the name The Sterlingworth Co.
50145 The Sterlingworth Co. 03.jpg
To further distance them from the Ansley H. Fox double the early guns were marked Wayne Junction instead of Philadelphia.
50180 The Sterlingworth Co. 01.jpg
and they even issued their own The Sterlingworth Co, catalog for 1910. By 1911, this entry-level gun was included in the A.H. Fox Gun Co. catalog --
Sterlingworth picture 1911.jpg
Sterlingworth text 1911.jpg
Ansley's earlier companies, Fox Gun Co., Balto., MD. U.S.A. (1898-99) --
438 B 01.png
and the Philadelphia Arms Co. (1902 t0 1906) --
262 A-Grade 01.jpg