I'm most grateful to Richard B, from whom I've received a PM informing me that this parasol monoplane is, in fact, German - which, on reflection, seems entirely logical for an aeroplane constructed, in 1930, 'entirely on sailplane lines'. It is the RRG Hummel designed by Fritz Stamer of Rhôn-Rossiten Gmbh. It first flew in 1930 and was powered by a 18 hp DKW engine. Thank you, Richard. And if you're reading this and would care to offer the next challenge, I'll be grateful to you. But if not, then it's open house.
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