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Hexagon downriver vintage camera - YouTube

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This is a very unique camera. I have researched it and have found very little about it. Thanks to Vintage camera collectors on facebook I was able to get some more information.
This is a copy of the post:
My original question:
If anyone has any information about this camera I would appreciate it. Thanks
Replies:
MIKE E Says:   Its an export version of the Contax D SLR. They usually had aftermarket name plates riveted to the front of the pentaprism like that to cover up the original Contax name. They're fine cameras, if in good working condition. 

Interestingly, you have an aftermarket Accurapid winder on the camera which is uncommon. They were usually cheap back in the day, but have become somewhat sought after accessories.

Richard C Says : Definitely an export Contax D, quite a find and very genuine.

Yves S Says:   The Contax D was not allowed to be imported into the USA at all

Richard C:  which makes it all the more interesting.
Manage

Yves S That it is a type D camera is already clear. Under "Hexacon" engraved sheet certainly stands "Pentacon".



Daniël S East Germany Pentacon.

According to Camera wiki:

The next model was called the Contax D, and was more the result of gradual evolution than a radical change.

In 1948 the two branches of Zeiss Ikon, East and West, were finally separated. In a series of lawsuits the Eastern branch would lose the right to use the historical names, like Contax. They continued to use the Contax name in the Eastern block market, but adopted the name Pentacon for the export to other countries. Pentacon comes from Pentaprism Contax, but is unanimously qualified as an unfortunate choice.


So I am not sure what it is. 
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