Circa 1920 "C.W. DuBois" Gun Sights catalog which measures 3-1/2" x 5-3/4" with 30 numbered pages.It features 6 pages of Stewart sights,the DuBois adjustable receiver sight,the DuBois Adjustable Rifle and Carbine sight,5 pages with Lyman sights,the Marbles flexible peep sight,the DuBois rifle cleaner and the Ross rifle M 10 .280 caliber.Al the items are priced.There are also 4 pages of sighting tips and other miscellaneous items offered.There is no date or code but the numerous dated testimonials date it 1917-1920. Excellent Condition