Another, obviously smaller caliber anti-aircraft weapon, of the 20mm to 30mm caliber range. I'm guessing this is a Soviet or other Warsaw Pact design, but I'm not positive.
what it was used for and what LOOKS like is 2 complity diffant things. And it looks to me like a house that has been tiped to a 45 degee angle and 2 speres just crashed tough it.......kinda
It's a 3.7 mm anti-air cannon the same kind mounted on ostwind flakpanzers.
It is an experimental late WW2 German Flak Weapon.
... I think thats Japanese... but im not shure.
It may be neither. Could be a pre-WWII design from another nation.