Just to muddy the waters a bit, in the first two A.H. Fox Gun Co. catalogues to include the Sterlingworth, "Campfire" Catalogue No. 24 (1911) 12-gauge only --
Sterlingworth picture 1911.jpg
Sterlingworth text 1911.jpg
and "Campfire" Catalogue No. 25 (1912) 12-, 16- and 20-gauge --
1912 Sterlingworth Picture.jpeg
1912 Sterlingworth Text.jpeg
While under
STOCK they say "
Full capped pistol Grip Only." they also carry the line "
Any change of stock, deviating from standard length, drop, or style, additional...……………………………$10.00" net. Adding $10 to the $25 price of a Sterlingworth got one to within $2.50 of an A-Grade ($37.50) where a grip choice was part of the deal and you got better walnut and Krupp barrels.