This is a COPY of the original.

Instruction manual for Singer sewing machine 15-91 (1954 edition) - 64 pages plus parts diagram and list

Our manuals are printed copies, sized 8 1/2 × 11 inches and bound with a clear plastic front cover, a plastic comb spine so that they can lie flat when opened, and a cardstock back cover. 
Most are enlarged from the originals.