A couple of years ago I saw a frame on eeekBay.
I down loaded some pictures of it and kept them in a file. It was in very nice condition and all looked original.
It had the 51 style front engine mount but also had the later top engine mount and later tool box bracket.
My thought is that it was a 1952 frame.
The strange thing about this frame was that it had a raised LJ forge stamp above the steering lock on the neck. The LJ was on its side.
Has anyone got any information on this style of neck. eg alternate foundry or reason for the mark.