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I'm quite sure, that this is something post-war. Chrome-rims weren't usual before 1950. And it's not original either. By shape and style of the front and the fuel-tank, it's in the "Café Racer"-style of the late 60ies. In the 30ies and 40ies there weren't definetely any motorbikes "tuned up" like that one. I do not know how to make this link work, but one picture on this site resembles that same bike, I think. Pity it does not state what it is ! Link to "moto.allegro.pl" Could it be an older Ural/Dnjepr ? The Boxer engine seems quite "BMW-ish"...

That's a Ural M63 with different front mudguard and dual seat bodge fitted. http://www.velodrom-millenaris.eu/velodrom_millenaris/jarmu/borbely_ural_1965.jpg

Ural M72

It's a Rudge Special 500cc ohv, approx 1937