1957 Colt Rifles & Telescopic Sights Catalog which measures 8-1/2" x 11' with 4 pages.The 2 inside pages feature the Colt"57" rifle(made 1957 only)and Colteer "1-22".The back cover features the Coltmaster and Coltmaster Junior scopes.The code on the back is "Form No. RS-400". Excellent condition with some light foxing,lower right corner bump and 3 holes for mounting in a binder