My August 1893, Chas. J. Godfrey catalogue has the American Arms Co. semi-hammerless single barrel with a Twist barrel in 12-gauge for $11 and 10-gauge for $12.50.

This is the offering in my 1900 J.H. Johnston, Great Western Gun Works catalogue --



The caption in my files on this ad says it is from 1890 --



but here is another ad annotated as 1890 with a different address --