fk51_k32_34lijn_ols40.jpeg Koolhoven FK.51 K-17Thumbnails(Glenn-)Martin B.10Koolhoven FK.51 K-17Thumbnails(Glenn-)Martin B.10
1940

The Koolhoven F.K.51 was a 1930s Dutch two-seat basic training biplane built by the Koolhoven Company
(https://en.wikipedia.org/wiki/Koolhoven_F.K.51)