Hello,
http://cgi.ebay.de/ws/eBayISAPI.dll?...m=320110528898
is the prototype of the Dewoitine HD-780, the floatplane version of the D-520 !!! It had never flown.
Probably seized by german troops in November 1942 , (look at the he 111 in the background)
Rare !!!
Von Alles