I now have this little beauty, thanks to Mike Steinberg!
Pictured here with the Argus viewfinder, this camera is very compact rangefinder made in 1956.
I have two lenses; I tested it with one, 50mm Braun-Katagon 1:2.8, and while been somewhat prone to flare the lens has nice bokeh and relatively sharp.
I'll definitely try shooting it more.