Source Unknown - Aircraft used licence built German DB.601 engine which was the only Japanese fighter with a liquid-cooled engine. Only 374 Type 2 aircraft produced.
This ki-61 is a 61-1 or a 61-1 Kai when you look at the cockpit rearmost glazing and the small windovs at the front part of cocpit, it is cleraly a 1 series type.
Vertical stabilizer on a series 2 is also broarder.
