Hello,
There is a "For Sale List topic" under "site suggestions" that discussses how this works.
Kind regards.

there are 2 versions of this camera Bob I with changeable lens L39 Leica thread
Bob II fixed lens, flash attachment on top.

Mildred Scheel was the wife of West German Federal President Walter Scheel. A great philanthropist and friend of Andy Warhol. She had Polaroid to produce 1000 gold-plated cameras which were then auctioned specifically for her charity, the German Cancer Fund "Deutsche Krebshilfe". The camer...

Probably part of a series of movie cameras. This model looks closer to what you have https://www.christies.com/en/lot/lot-6099972

My guess is that this was a leathered covered camera but as the leather was probably deteriorated someone removed all the leather - do you still see leather traces/black remains of leather? Potentially this could then be a folding ensign https://collectiblend.com/Cameras/Houghton/Folding-Ensign.html...

I don't think I can add very much but it seems to me that Samuels might not have been a producer of cameras, I can not find anything on the company as a camera manufacturer, maybe Samuels was a camera distributor/shop that had other companies make branded cameras. The Stirn detective camera looks in...

Looks like it is an 8 mm camera. Here is a link: https://www.etsy.com/be/listing/1644293100/bell-howell-director-series-8mm?gpla=1&gao=1&&utm_source=google&utm_medium=cpc&utm_campaign=shopping_be_du_be_-electronics_and_accessories-other&utm_custom1=_k_Cj0KCQjwzZmwBhD8ARIsAH4v...

Nice piece of research and well presented on your site. Congratulations.

Hello Etienne,

The high price is probably related to the fast lens 1.9.
Other Klein Mentors have much lower pricing.
https://collectiblend.com/Cameras/Mentor-Goltz-&-Breutmann/Klein-Mentor.html

Best regards.

Impressive collection, congratulations !!