Quackenbush Model-7 Air Rifle.
With thanks to Beth of Amoskeag Auctions, Inc. for permission to post these pics.
The original auction blurb said: "This is a fine example of a Quackenbush air rifle produced from 1912 to 1936. This rifle uses a push barrel action, has a smooth bore of .175 cal and is single shot. Metal surfaces retain a pleasing brown patina with some silvering and just a hint of the original blue. The stock is black walnut and is near excellent condition with only minor nicks and handling marks. A drift adjustable rear sight and fixed front sight are original. The gun functions well."
Amoskeag auctioned a second example of this model:
The information below is taken from the catalogue advertising the auction of the Myron Kasok airgun collection, sold by the Rock Island Auction Company December 13-15, 2003. Pic is copyright Rock Island Auction Co.