Thanks for the lock. I'm not sure how this will come out, because much of my information is conflicting, but I will give it a shot.
Slaby-Beringer was largely controlled by J. S. Rasmussen, who also controlled DKW. In 1923 DKW only made motor cycles, and, when economic conditions caused financial problems for both Slaby-Beringer and DKW, Rasmussen got Slaby-Beringer to design a small gasoline powered car using a DKW air cooled motorcycle engine. This would account for the apparent lack of radiator in the puzzle car, although there must be some sort of grille for the flow of cooling air, unless the engine were front mounted (like a Morgan), but I rather doubt this, as I think something would be visible in the picture. Some references seem to indicate that the car might have even been a crude hybrid. with the electric drive left in place, and the gasoline drive coupled to it. In any case the car did not save Slaby-Beringer, as they were forced into bankruptcy in mid-1924, and were folded into Rasmussen's DKW. The little DKW powered Slaby-Beringer went on to become the basis of the DKW P15 of 1928/29, which morphed into the water cooled DKW PS600 of 1929/31.
Whatever the details, I'm guessing that the puzzle car is the little DKW powered Slaby-Beringer of 1923, perhaps even the prototype, given the apparent crudeness of the upholstery.
