It's a Kodak Duaflex IV, a twin lens reflex camera made by Kodak between 1947 and 1960.

I will use it for Through the Viewfinder (link to tutorial) pictures.

The photo above shows you one of my 'old' toys, seen through the viewfinder.
I didn't use a
contraption but in my stream you can see some pictures taken
with the use of a contraption.

This is the real stuff not a fake like this one.

I will post it in these groups for sure:
"
Noise & Dust / TTV"-group and
"
Pure TTV (the old fashioned way)"-group.