Inventor of the biplane used in WWI called the Sopwith Camel (1888–1989). Flown limited edition commemorative cover, 7.5 x 4.5, with a color cachet honoring Sopwith, flown in a Hawker aircraft, signed on the front in green felt tip “T. O. M. Sopwith.” In fine condition. RRAuction COA.
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