JP were the initials of John Piggott of 117-118 Cheapside & Milk Street, London, who produced a motorcycle early in 1913.
Advertised as the "Impregnable" Motor Cycle, the machine had a 2¾ hp T.D. Cross engine, belt drive and sprung forks at a price of £27/10/0. There was also the option of an Armstrong hub gear for £9/10/0.
The motorcycle was listed until the middle of 1914, but the outbreak of World War I stopped any further production.
An example of the J.P. Impregnable, registration DS7023, is discussed in an article by Jeff Clew in an issue of The Classic Motor Cycle
The firm was best known for its automotive clothing and photographic products, which included a folding cylist roll film camera.
Sources: Graces Guide, historiccamera.com
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