Thanks JulianS
Well I'm gonna go with you on this M33 500cc now the restoration will start
It's been in the celler since God was a boy and we are missing out quiet a lot of parts. We have the bulk . The crank cases are also shot with  crosion where it's been left on it left hand side it's just powder
There is absolutely no sign of any engine number so wonder if it was service replacement case assy but it's good to  see parts available for the old girl is still quite good.
We also
Have no log book or reg for it either  so I assume I will have to contact the relevant person in  aid to find out what it was so we can get a V5C logbook for when the time gets close for road worthyness

Hi guys
I'm new to the site but I'm in need of help. While doing a gas inspection in came across a bsa
And.. erm I haven't got a clue about what it is .age and so on. I'm not new to bikes  just British bikes I have never had one so pretty clueless  about this one
I have got engine and frame I'd just the need to know about this so I can get on with the task in hand
Any help would be much appreciated
Kind regards Paul