Hi Mark

Many thanks for the reply!

I will take a look at removing the strap to check the serial, but in the meantime have some more questions if I may...

The shop who arranged the repair did not seem to know much about these watches at all. I asked about water resistance, and they said best to treat it as 30m, but I have seen other info on the web mentioning 100m. Having been factory serviced I would expect it to be at the original water resistance, do you know what that would be?

Also the crown only winds in one direction, and I don't feel any mechanical resistance when doing that, so I'm not sure if the crown winds the watch or if it is only the auto-winder that does it.

Lastly, the shop set the date wrong - is it ok/possible to wind back to an earlier date?

Yes, it is good to be wearing something that connects me to my grandfather - he used to ride a BSA motorbike as well, but that's for another forum!

Cheers

Bob