Vintage Petter Petrol Engines PA-PAK Operators Handbook (publication 2074/4), dated 1959.  A softback booklet measuring approx. 21.5cm by 14cm, with 61 pages.  In workshop used condition, with some grubbiness / oil staining to the cover, and edge scuffing / wear.  The staples have rusted, so inner pages may come loose.  There is page browning, and some historic watermark staining to the lower half.