Heinkel He 112
The He 112 was the Bf 109's rival for the contract as the German Air Force's first monoplane fighter. The Heinkel was comparatively advanced, and the first of an eventual 12 prototypes flew in the summer of 1935.
The Luftwaffe then selected the Bf 109, but the German air ministry was sufficiently impressed with the heinkel fighter to order 43 He 112b-0 pre production aircraft that operated with a fighter wing during 1938. The He 112 was also sold to Spain, Japan, Romania and even Hungary managed to aquire a few.