frame number location

[bazza6]

Hi Everyone,

I have a 1973 Triumph TR6R which I believe is an ex- UK police bike. Although the engine number is clearly stamped on the left hand crankcase I cannot locate the frame number. Rumour has it that some Triumphs coming out of the factory at that "confusing" period never had a frame stamp, but I am more inclined to think that at some point in my bikes history the frame was repainted or 'stove enamelled' and obliterated the numbers. I wonder if anyone out there could tell me the places to look for this frame number so I don't have to scrape the whole frame looking for it . Failing that I suppose I could re-stamp it myself, in which case should I use 3mm high or 5mm high metal stamps ?
Thanks
Bazza6

[L.A.B.]

The frame stamps are often shallow, but a number should be there, unless the frame has been renewed? For 1973 I would expect it to be stamped at the very top of the left hand down tube?
If not, then look on the steering head itself.

Apparently some Triumphs around that period were stamped on the right hand side!