Could it be a "refurbished & repurposed" medium format rangefinder? If so, the advance lever probably does nothing.
I agree that it has many similarities with the Voigtländer Bessa III, however, the rangefinder unit looks somewhat different (though among the medium format rangefinders that I've seen so far, the Voigtländer Bessa III looks the most like this Instankon RF70).