Svenska Aero started designing a fighter in the late 1920's, in spite of low interest from the air force which preferred foreign designs, licence produced in it's own workshops.
Svenska Aero thought the Siddely Jaguar would become the standard engine, and designed the Jaktfalk (hunting falcon) for it.
The air force decided to purchase three for evaluation. The Jaguar engined became J 5 and it remained in the air force from 1930 until 1933. The two Jupiter VI engined ones became J 6, and in 1930 five additional ones were ordered.
In 1931 three Jupiter VIIF engined examples, with slightly redesigned fuselage and landing gear, were ordered as J 6A. They stayed in service between 1932 and 1940.
A further seven with small modifications were ordered from ASJA, which had bought Svenska Aero, as J 6B. They were in service between 1935 and 1939, finally scrapped in 1941.
The J 6As were modified to J 6B standard.
In 1939 one J 6A and two J 6B were given to Finland.