I don't have anything ready to post so if anyone wants to try their hand at stumping us with another , please go ahead and post. If no takers I'll put one up later this evening.

well , there was the ARADO 232 although that had a few more than 4. 

 1 - single engine

 2 - 2 seat biplane

 3 - slightly swept wings

 4 - ailerons on both wings

 5 - 9cyl radial  air cooled engine 

 6 - fabric covered wings

 7 - designed to be capable of using wheeled or float undercarriage

 1 - single engine

 2 - 2 seat biplane

 3 - slightly swept wings

 4 - ailerons on both wings

 5 - 9cyl radial air cooled engine

 6 - fabric covered wings

 7 - designed to be capable of using wheeled or float undercarriage

 8 - 1st prototype completed in 1931

 9 - the original order was given to a company in another country

10 - a third prototype was used as the basis for the production of some 590 bubilt

1 - single engine

 2 - 2 seat biplane

 3 - slightly swept wings

 4 - ailerons on both wings

 5 - 9cyl radial air cooled engine

 6 - fabric covered wings

 7 - designed to be capable of using wheeled or float undercarriage

 8 - 1st prototype completed in 1931

 9 - the original order was given to a company in another country

10 - a third prototype was used as the basis for the production of some 590 built

11 - the country that commissioned the design and built over 500,retired theirs

      early in ww2. while the country that developed the design and built only around

      78, kept some of them in service until sept 1944

12 - Dive bomber