Restoring or assembling a Humber 350cc single? Then this could be a jolly helpful addition to identifying what you have got or may be missing. It has some excellent plate photographs of parts, as well as 2 cutaway photos of the engine. Contained within is also the additional parts for the Deluxe model with lighting set. It also has some sectional drawings of the ML magneto, B&B carburettor and manual oil pump (Enots?) which were also used in a host of other motorcycles from that period.
Click on the front cover below to see the complete 37 page manual.
It is a 11M PDF so you will need Adobe Acrobat Reader to view it.