Форум Breguet's Aircraft Challenge
This is an early design (1918) of Grover Loening, probably one of the first designed and built in his new company Loening Aeronautical Engineering Co, 31 St at East River, New York.
The Loening Duckling was quite special for the time, a tractor flying boat (60hp Lawrance L-2). The engine mounted high in front of the pilot, the spacing between the wings very much greater than usual. Also special is the double tail.
I think this flying boat was designed as a sporting plane at the end of 1918, maybe just after the armistice. It was probably a single machine.