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Another desireable Norton would have to be the prototype laydown flat-motor Manx F type of the 1950s. ? 

Recognising that manx victories were on the decline, and the 4 cylinder watercooled design still a long way off, Joe Craig et all tried a Guzzi style laydown motor design of manx, with unit construction gearbox. While the lower CofG gave better handling, the lack of performance compared to the oppositions 4's meant it was never raced, and Nortons pulled out of GP racing.

http://www.motohistory.net/images/SpaManxPrototype.jpg


The remnants of this bike survived, and once acquired by the Sammy Miller Museum was rebuilt to a raceable machine, as here. Thanks to someone for the pics...


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