You have it sablatnic it is the Sage Type 3.
Frederick Sage & Company was a British shop fitting company based in London with an extensive practice in Europe, South Africa, and South America. During both world wars it built and designed aircraft and after the Second World War it executed much of the woodwork for the rebuilt House of Commons. The Sage Type 3 was designed in 1916 at the request of the Air Department of the Admiralty for a trainer. The main requirements were for a robust aircraft with a low landing speed.The Sage Type 3 was completed in Jan 1917, as a two-bay biplane powered by the 75 h.p. Rolls-Royce Hawk. Six experimental machines were ordered, and there was the prospect of substantial production to follow.The prototype, N. 5280, first flew on January 5th, 1917. The performance of the Type 3 was rather poor, even for a trainer.
J M Bruce in his book “British Aeroplanes 1914 – 1918” states; “The prototype underwent some modification and was fitted with smaller vertical tail surfaces; the all-up weight was reduced somewhat and the maximum speed was increased by 4 m.p.h. In its modified form the machine was known as the Type 3b, and the original form was retrospectively re-designated Type 3a.”
Only two aircraft were built.