'Fraid there is absolutely no possibility whatsoever that is an original triple VIN.
As triples were first made in the 1969 'season', apart from the first few hundred, all have the 'model code - two-letter date code - five-figure number' format VIN (sometimes with the model code at the end).
The aforementioned 'first few hundred' are in the format 'model code - three-figure number' (e.g. 'T150T101').
The VIN you've got would, at first glance, appear to fit the standard triple format, until you realise that '120R' is the 650 Bonny model code (triples are T150T, T150, T150V, A75R, A75RV, A75V, V75V, TRX75 or T160), 'U' (in the 'DU') isn't a 'season' letter and 'DU' is the pre-'69 650 prefix.
Originally posted by Mark J: These numbers do not look to be tampered with,
Set of originally unstamped cases, drive-side case laid square on a bench, fabbed guide block that fits around the raised VIN pad, bit of care, ...
Mind, I've only heard this, never done it myself ...
That said, it'd could be quite instructive to take a good, careful pencil rubbing of the engine VIN and check alignment of letters and numbers with a ruler and magnifying glass - if you don't have the original production-line stamping tool, there's only so much 'care' can achieve.
Originally posted by Mark J: any chance it is a misprint or mistake??
Depends what you mean? All triple engines were built at Small Heath, where they were stamped with the model code and the five-figure number. Engines destined for Triumphs were then trucked over to Meriden (at least until the beginning of the workers' sit-in in October '73), where they were fitted into cycle parts assembled at Meriden. During this cycle-parts assembly, the date letters were added to the engine and the whole VIN was stamped on the frame.
Otoh, Triumph 650 twins were made entirely at Meriden.
Then, why would anyone at either factory stamp a pre-'69 650 VIN on a '69-on triple?
I don't know how the vehicle registration process works in Ohio, or wherever the bike came from but, if I'd found this in GB, I'd suspect the marriage of what we call a 'log book' for a bike that no longer existed (the T120) to a bike (the triple) that, for whatever reason (theft?), couldn't be registered with the VIN it left the factory with. All British vehicles have had registrations (letter'n'number combinations) and log books for decades, issued and maintained by counties before 1974 but centralised on a computer in Swansea, South Wales from that year.
Somebody had a title with no bike, a bike with no title, a file and a metal stamping set. A few minutes later he had a bike with a title, some aluminum filings, a file and a metal stamping set. Then he didn’t have to worry about getting into the type of argument that before the days of motorcycles usually started with the statement: “This is TOO my horse!”
Sounds, HIGHLY possiable but they did a great job,these numbers are nice? Another guy says that the 650 outer cases are able to be used on the triples is that a maybe,that a numbers side 650 case was used?
Nope. Totally different engines. The 1968 650 twins started with number DU 66246. The '69's started with number DU 85904. What you are looking at is a Trident with a '68 Bonneville title. According to the Trident parts book: "The frame number is stamped on the left side of the frame, on the front engine mounting lug. Both engine and frame numbers should coincide." What's the frame number on this Trident?
Just as a matter of interest, where this VIN is stamped on the engine, is it on a raised 'pad' on the drive-side case, just under the barrel base flange? And is the 'pad' covered in lots of tiny stamped 'Triumph' logos?