G.Swanborough, P.Bowers United States Navy Aircraft Since 1911 (Putnam)
The Standard Aero Corporation was formed in 1916 in anticipation of America's eventual participation in World War I. First products at the company's Plainfield, NJ, plant were Model H-3 reconnaissance-trainers derived from earlier Sloan Aircraft models designed by Standard's chief engineer, Charles H. Day. First sales by Standard to the Navy were three Improved H-4-H seaplane trainers (A137-A139) delivered in 1917. Power plant, 125 hp Hall-Scott A-5.
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The Standard H-4-H (H for Hydro). The exact serial which can be seen is A137, making it the first of a series of three (A137-A139) ordered by the US Navy.
There were two earlier Standard seaplane models ordered by the US Navy, that is A91 [ Standard seaplane ] and A92 [Standard Twin seaplane], the order of which was cancelled.