Dear Richard,
Here is a web site for someone who deals in vintage cameras, both still and motion picture. He may be able to help or suggest a catalog or reference book. His e-mail is near the top of the page.
http://www.xs4all.nl/~wichm/cinelisc.html#S
If you scroll down the alphabetical listing to Siemens & Halske AG, you'll see a few items in blue, which you can click on to see the actual camera.
Regards,
Ed