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All the notes I've read tell us that the frame number is on left face of upper front downtube headstock lug.
Went to Brooklands today. Denis Jenkinson's Model 40 (with later 500 engine) has its number on the upper front engine mounting lug, about a foot below the headstock. And mine also has it on the engine lug.
Both are stamped in two rows. Upper number is '40' or '30'. Below that is the frame number.
The two models had slightly different frame sizes so it must have avoided mixups at the work to have model numbers.
Both are early 30's.
Inter frame number
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Not my bike. I don't dare…
Not my bike. I don't dare post pictures for fear of critics
All this picking up on numbers is nonsense anyway. The only thing that matters is if the numbers match the documents.
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Something wrong there , the frame number has one digit too many , should be only 5 not 6.