The previous topic on chassis numbers mentioned bonnet numbers. I have always been puzzled why my J2 has no trace at all of any sort of numbering or lettering on the bonnet hinge on what was a fairly original untampered body. I suppose it could have been a replacement but that seems unlikely. Also one of the bonnet sides has at some time a tapered fillet skilfully welded/brazed to the front edge to bring it back to the vertical. About 1/2" taper as if to accommodate a sloped radiator and then repurposed? I know, I must get out more (but it's tippling down"!) Simon C.
Like Simon's, no stamp or marking has ever been found on my J3's bonnet hinge. I am relatively certain from other evidence that the bonnet is original to the car. It is possible, even lkely, that the original blue paint was not factory spec.