Richard, if the serial number is 93xxb, then it would be in the military style and usually not in the commerical style. Was there something that made you believe it was a commerical?
A sear safety, if like this picture
The sear safety is on the top of the picture, then it is a police with the sear added 1933.
Any numbers on the top of the gun? i.e. a date or dates?
"S. Hn. 184.". This could be S = Schutzpolizei (municiple police force) Hn = unk and then the 184 would be the weapons number. I have seen Hn before, and will look it up...
Ed