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Ian,It seems you have a 1961 G12 frame and a 1963/4 G15Mk2 engine. If the frame number is genuine, I doubt the frame is a pre-production version. Why would the factory use a 2 year old frame, which has the wrong headstock? Beyond all, the G15 engine doesn't line up with a G12 frame.Of course it's possible someone re-stamped a G15 frame for obscure reasons. This was certainly not done by the factory.Have you tried to mate the engine and frame using the proper engine plates?A75554 G12 would be stamped at the right downtube below the headstock. A G15 frame would be stamped at the left downtube below the headstock.-Knut
Ian,
It seems you have a 1961 G12 frame and a 1963/4 G15Mk2 engine. If the frame number is genuine, I doubt the frame is a pre-production version. Why would the factory use a 2 year old frame, which has the wrong headstock? Beyond all, the G15 engine doesn't line up with a G12 frame.
Of course it's possible someone re-stamped a G15 frame for obscure reasons. This was certainly not done by the factory.
Have you tried to mate the engine and frame using the proper engine plates?
A75554 G12 would be stamped at the right downtube below the headstock. A G15 frame would be stamped at the left downtube below the headstock.
-Knut
