Original 1931 BSA Motorcycle Plans displaying the general arrangement of the BSA 2.49hp O.H.V Deluxe 1931 Model B31-3 half full size, t/w 1931 BSA 2.49hp O.H.V. Deluxe Motor Cycle Engine 63m/m x 80m/m Stroke, the plans used in order to construct the model and engine, dated with approved signatures, printed on linen direct from the original drawings, ready to frame, largest measures 100 x 72cm approx. (2) Note: Obtained from the previous BSA Motorcycle factory in Redditch, items that are rare on the market.