Wow! That's a BSA Bantam, in mint condition too! That was the very first motorcycle I rode, back in 1971 at my relative's fruit farm in Pontian, for the technology back then, I think this must have been quite a reliable model. My uncle's bike had a huge rattan basket at the back of it for ferrying fruits from his farm to the town, and I remember they were considering a Japanese model bike and there was prejudice against the jap bike, but my dad urged them to proceed with the purchase as the motorcycle industry in Britain was dead by then. I think this BSA had only three gears if I remember correctly. Nice.
Cheers!