Quackenbush Model-3 Air Rifle.
With thanks to Sean Campbell, imaging manager of the Buffalo Bill Centre of the West in Cody, Wyoming, for permission to post these pics of a gun held in the Cody Firearms Museum. The blurb accompanying this gun follows.
Accession Number: 1993.8.51
Date : 1885-1900
Dimensions: L: 35.625 in, Barrel length: 15 in, H: 8 in
Credit Line: Gift of Thomas K. Hutchinson
Inscription: left side, frame: 8488 [bottom of barrel] 8488
Synopsis: firearm- rifle- airgun- H.M. Quackenbush; Herkimer, N.Y.- wood- steel- left side, frame: 8488 [bottom of barrel] 8488- no.2- .22- 8488