This motor is a Walter 109-509.A-1, serial M-1739, with a manufacturer's stamp indicating the manufacturer to be hnx. It's Science Museum accession number is 1985-2003.

Previously undescribed in the mainstream literature, the existence of this motor has only recently come to light. It is now part of the Science Museum's collection, and is on occasional display at the reserve store at Wroughton.

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