De Havilland Moth 600 Hour Test, print by Frank Wootton. DH Advertising

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I have no idea how to list these prints, as I cannot find anything to compare them to. I have listed them as used, but they have never been framed, so they are as new. They are by Frank Wootton and show a variety of interwar DH aircraft and factory scenes. They are a series produced by DH Advertising (we think) after WW2 for use within the company as long service awards (we have several of the presentation folders to fit the prints marked "Presented to.......in appreciation of twenty years service with the de Havilland Enterprise") Each has a picture with a detailed description below it. The next print is of the Moth that performed the 600 hour sealed test in 1929. The description reads "An event which served to demonsmtrate to the world the outstanding reliability of the Gipsy One engine was the 600-Hour Sealed Test conducted in 1929. An engine picked at random, from the new production line at Stag Lane was fitted into a Moth, which during the summer months flew day in and day out in the hands of Geoffrey Raoul de Havilland-then aged 19- and a number of other pilots. After 600 hours of flying, the engine, untouched except for routine cleaning of plugs and filters, was put on the test bed with the seals unbroken, and showed a power drop of less than two percent. It was afterwards stripped and reconditioned, the cost of the replacement read more