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The G15 frame is indeed a development of the 1964 G12 frame (and the G3/G80, for that matter). If A75554 is a legitimate stamping, it can´t be a 1964-on frame.Your frame with serial no. A86783 is probably a late model G12 frame. While I have never compared the last model G12 and G15 frames one to one, two or four front lugs will be positioned differently and stud bolt sizes may differ as well.Edit: Going by the pictures received, the frame number as without the prefix 'A' and the number is stamped in the wrong place. Indeed, frame no. 86783 belongs to a late 1952 model. http://archives.jampot.dk/general/Matchless_Frame_Numbers_1950-1966_AJSMOC.pdfNow, that can't be since technically the frame corresponds to a 1964-66 duplex frame, with provision for Roadholder forks and a swinging arm to take a Norton rear wheel. Therefore, I suspect the bike was stolen and the frame re-stamped to make it "road legal".It would be interesting trying to recover the genuine frame number!-Knut
The G15 frame is indeed a development of the 1964 G12 frame (and the G3/G80, for that matter). If A75554 is a legitimate stamping, it can´t be a 1964-on frame.
Your frame with serial no. A86783 is probably a late model G12 frame. While I have never compared the last model G12 and G15 frames one to one, two or four front lugs will be positioned differently and stud bolt sizes may differ as well.
Edit: Going by the pictures received, the frame number as without the prefix 'A' and the number is stamped in the wrong place. Indeed, frame no. 86783 belongs to a late 1952 model.
http://archives.jampot.dk/general/Matchless_Frame_Numbers_1950-1966_AJSMOC.pdf
Now, that can't be since technically the frame corresponds to a 1964-66 duplex frame, with provision for Roadholder forks and a swinging arm to take a Norton rear wheel. Therefore, I suspect the bike was stolen and the frame re-stamped to make it "road legal".
It would be interesting trying to recover the genuine frame number!
-Knut