 The prototype was called Sääski I and was completed in the early spring of 1928.The aircraft's civil registration code was "K-SASA" and it was sold to the Finnish Air Force on June 25, 1928.The constructors of the aircraft formed a company called "Sääski" in 1928, obtained the manufacturing license from the designers, and had four improved Sääski II's built by the State Aircraft Company for civilian use.