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Code: Prot 3
Air Ministry 'Douglas' Combined Protractor & Parallel Rule. Stores reference 6B/47. Perspex, approximately 12 x 12cm. Marked with a grid and compass bearings around the edges. A. Crown M. marked. Complete with original card sleeve printed with instructions. Part of the aircrew navigator's kit. A bit grubby but undamaged. Stock code Prot3.