In 1932, Besson created the MB.410 by replacing the twin floats of the MB.35 with a single main float and two outrigger floats just inboard of the wingtips. The engine was cowled and fuselage streamlining was improved. The prototype was destroyed in a fatal accident during testing.

The French Navy required a spotter aircraft for its new submarine Surcouf, and ordered a production version, designated MB.411.It was specifically designed for housing in a cylindrical hangar in the back of Surcouf's conning tower. The Besson MB.411 could be assembled to put on the wings in about 4 minutes (at open sea up to 20 minutes) after it was removed from its hangar, then lowered to the water and retrieved by a crane. MB.411 was a low-wing monoplane with a large single central float and under the wing two small stabilizing floats. The Besson MB.411 was constructed with a mix of wood and metal, with canvas covering. In autumn of 1934, the MB.411 was sent to Brest for boarding trials on the Surcouf. Surcouf took the Besson MB.411 to the Caribbean arriving in September 1935 for sea trials. In January 1936 MB.411 returned to Mureaux for changes. The second MB.411 was completed in February 1937. The second MB.411 made its first flight December 1937 and was delivered July 1938. The second MB.411 replaced the first in the Surcouf.

Holy moly this thing looks so good. It took forever, but it was worth it. I would love to see this thing featured. Thanks to Aarons123 for bringing this aircraft to my attention. If you guys have any suggestions for new aircraft, please let me know.
ENJOY!!!

-OC3LOT1142

Credit to AgDynamics for the letters

Thanks to Aarons123 for the suggestion