It's a Curtiss F Boat modified in 1913 for the tractor magnate Harold F McCormick.(Also known as the 'Spoonbill') I think Uli in his post signalled that he knew it, so over to him -
The designer's Nº 1 biplane was on here about four years ago. This is his No.2, in sesquiplane form, before the lower mainplanes were extended to full length
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