You can find lots of information at
http://www.arguscg.org/ The Sandmars were 35mm and 100mm f4.5's that were added to the C body line, and were manufactured in Germany by Enna Werk, Munich. I got much better results with the C-3 and C-4 (Modified, C-4R) lenses than with the C-44 lenses. Of course, when one is involved in using old lenses and cameras certain factors may affect the image quality, but from what I saw it was immediately obvious the C-44 lenses just don't cut it. But I only own one set of them, so there might be some nice ones out there.
PF