- Role: Fighter
- Dimentions: Wingspan 9.40 m, length 8.10 m, height 3.15 m
- Engine: 1 x Hispano Suiza 12Y-21 (860 hp)
- Armament: 4 x 7.92 mm Vickers MK30 machine guns
- Crew: 1
- Number in service: 2
- Country of production: Czechoslovakia
- Years in service: 1936 – 1941
The Avia B-534 (verze II) was the classic representative of the last generation of interceptor biplanes that appeared in the Great War. Two Avia B-534 (verze II) airplanes were donated to the Hellenic Air Force by the expatriate from Egypt G. Koutarelis in August 1936. Upon the delivery at Dekeleia Air Base they were named Koutarelis I and II. Their construction markings were 1001 – 1002.
From 1937, they were enlisted to the 1st Flight of the 24 Interceptor Squadron at Sedes Air Base. Until the delivery of the PZL P.24, they were the most battle-worthy interceptors of the Air Force. It is mentionned that the Avia B-534 from 1937 to 1940 were used for operational training purposes.