Calvert of Stoke Newington, London produced motorcycles from 1899 to 1904.
This short-lived firm built basic, primitive machines using their own and Minerva engines to produce simple and cheap motorcycles. Their model for 1903 was powered by a 2¾ hp or 3¼ hp engine. A forecar model had its single rear-wheel driven directly by chain.
Report from the 1902 Stanley Show
Calverts Motor Cycle, Ltd., Kingsland Road, N.E., show various novelties and sundries connected the motor industry. Two motorcycles are on view, both fitted with a Calvert engine of 2.25 horse-power, and weighing 110 lbs. There may be seen special trembler coils for high speed engines, one giving forth a spark over 0.5in. long. Among the items to be seen are two-stroke petrol engines for motorcycles and cars, giving 3 horse-power at 1,200 revolutions per minute.
Motor Cycling, 26th November 1902
Source: Graces Guide