Another Zenit M

a few days ago I noted an ad where Zenit 3M were sold in the Dutch (or Belgian) market as Zenit M - I remember this same time Zenit 3M with Industar 50 were sold in the British market simply as Zenit without any other indication.
Here comes another Zenit M forerunner prototype of TTL types.

http://www.bar90.ru/index.php?option=com_content&view=article&id=22&Itemid=1

going to collection...

http://www.ussrphoto.com/UserContent/15102011_zenit M.JPG

http://www.ussrphoto.com/UserContent/15102011_zenit M.JPG

Regards
LP

PS: there are also two pre 1917 Russian camera makers