You are buying a Winchester manual for the 50, These were approved for reprint by Olin Corp. in late 70s early 80s, They are one  book as the originals. This book is 63 pages Of the hand drawn assembly and disassembly instructions done by A.A. Arnod  in around 1957. I presently still have models 94, 70, 88, 12, 42, 61, 77, 63, 37, 50, 1400, and the following 2 books cover 3 guns each (250,270,290)(69A, 72, and 75) I will be opening my E Bay store soon for all models and combined shipping, Thank you for looking, Happy collecting, Dennis