Marek, sure we are in the Breguet Challenge for the period 1914 - 1918, according to rule 3
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3. The completed aircraft must have been either; designed, built or have left the ground during the '14-'18 period and be identifiable by the poster.
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The machine has been masterly sought out by Breguet for a unqiue #600, which baffles all experts certainly. I have the idea (just that), that the machine may originate from the USA
Cheers
Kees