The attached picture of my dad, Frederick Tilley, 102 Provost Company, Corps of Military Police, was taken whilst he was on leave in Leicester in 1941. Sorry about the quality of the image but this is the only one I have of him on his bike. I have got hold of a BSA M20 petrol tank and intend to restore it and apply the same makings that are in the photo. The tank will be a static display in my home. I was wondering if anyone could tell me what the 83 stood for and if it was likely to be painted straight onto the tank or onto a black square. Someone has told me that the latter is most likely to be the case? Thanks in anticipation Nigel Tilley, Leicester.