Royal Mail were motorcycles produced between 1902 and 1903, by Chambers Engineering of Birmingham.
At the late-1902 Stanley show the company exhibited three machines. One had a Clement-Garrard engine mounted in a cross-framed cycle; the second had a 2¾ hp Kelecom engine and both had chain drive. The third had a vertical 3½ hp engine with outside flywheel, spray carburettor, and belt drive.
Source: Graces Guide
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