Thanks for the further info, Raimey.
Now we even have a picture of the man himself!

If I read the date stamp on my gun correctly, my gun was made in Sept. 1939 - so the company must have still been going into WW2. Probably with Otto Bock Jr. or perhaps it was taken over by someone else.
I have not been able to find anything on Otto Bock after about 1910 on the internet.

Best regards
Günter