The graceful Do 24 was a German WW2 long range patrol flying boat, along the lines of the Allie's Catalina. This particular machine, on display at Deutsches Museum Flugwerft Schleissheiutside Munich, is a construct consisting of the fuselage of 5291 combined with the wings of 5345. It is painted up as a Spanish SAR bird, but I don't know if either airframe actually served in that role.