Quackenbush Model-1 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: 1993.8.50
Date : 1890-1900
Dimensions: L: 35.625 in, Barrel length: 16.5 in, H: 7.5 in
Credit Line: Gift of Thomas K. Hutchinson
Inscription: left side, frame: H.M. Quackenbush Herkimer, N.Y. U.S.A/ Pat. July 19, 1881 [left side, frame] 23395 [bottom, barrel extension] 23395
Synopsis: firearm- rifle- airgun- H.M. Quackenbush; Herkimer, N.Y.- wood- steel- left side, frame: H.M. Quackenbush Herkimer, N.Y. U.S.A/ Pat. July 19, 1881 [left side, frame] 23395 [bottom, barrel extension] 23395- .22- 23395
And a variant of the same model: