It is possible that it is a late version of a 6x9 III, but the Cameraquest page is mostly about the 4x5" cameras, not the 6x9. The other two lobes of the rangefinder cam haven't been cut for a specific lens, so you could have a 65mm and a 180mm lens coupled to this camera as well, if you have a repair technician who works on the older models. The photos also show a groundglass back, so you could use regular filmholders-nominal 2x3" or 6.5x9cm European style-and you can use the camera movements with rollfilm. The rangefinder cam and lens seem to be serial-number matched from the photos, so as long as the rangefinder is calibrated, the lens is coupled. Lever-wind Tech 23 backs work on the earlier cameras. The later lever wind backs don't have this problem, because they meter the actual film travel, while the older ones presume a certain thickness for the film and paper backing. These knob-wind backs will have frame spacing problems with certain films (you have to test to find out which ones). This looks a 6x9 Super Technika IV with an older, 6x9cm knob-wind rollfilm back. It is not a 4x5" camera with a rollfilm back. Interesting-I can see the link on my iPhone, but not on my laptop.
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