B50T. . Engine number

[brians]

Thanks Julian.
I persevered and found a frame number under the powder coating of my frame! See photos attached.
It looks like my frame is a B44SS produced in November 1969.
I can't make out the part number cast into the frame but I was expecting 92-9213 but the remains of my number looks like it ends in 8013 which is a bit of a puzzle!
Brian

[JulianS]

The cast in part numbers will refer only to the part into which it is cast usually a lug or bracket. It is not the part number for the complete frame just for one of the parts which go to make the frame.

[brians]

I did not know that Julian - every day is a school day!

I have another question but on engine numbers. In what circumstances might an engine NOT have an engine number stamped on it please?

See attached photo.  The finish on the casting where I would expect to see a B44 engine number looks like the original i.e. nothing ground off.

Any thoughts please?

Brian

[JulianS]

New cases supplied without a number. Dealer rebuilding an engine with broken case was supposed to stamp it with the original number.

[brians]

Thank you again Julian!
That causes a bit of an issue if trying to register a previously unregistered bike I guess?
Form V55/5 item 33 says "Engine number Give the full engine number, which you should get from the vehicle".