Spanish Civil War, all are of the Tip 5 variant
Japanese invasion of China, early models with closed (Tip 5) and open (Tip 6) cockpit
Japanese invasion and Spanish Civil War, later models (Tip 10 and Tip 17) and a Tip 18 from the USSR pilot school with yellow tail stripe
Late models which were in service around 1943, as engine power increased, the wheel doors were sometimes removed.