Circa-1958 Leupold Catalog Number 58.It measures 8-1/2" x 11" with 4 pages.It features Leupold Mountaineer 4X,6X & 8X scopes,Pioneer 4X scope,Leupold Adjusto-Mount bases and hinged rings,Leupold Detacho-Mount with Aperture sight and Leupold compassses.All the items are pictured with descriptions,specs and Retail prices.The code on the back cover is "158-25-2" and I believe it to be a 1958 issue. Very Good condition with creases where folded to fit an envelope,a 1/2" split at the edge of a crease and bottom edge nicks & wrinkles.