There are three mentions of a Caeco (made by Cambridge Automobile And Engineering Co) in the 1912 Motor Cycle, with 482cc 3½hp and 340cc 2¾ hp ohv JAP engines which competed in a race at Brooklands and a club hillclimb.
“A new machine, the 2¾ Caeco, ridden by H. P. Storey, made its debut in this class [350cc]. Unfortunately, it appeared to be suffering from over-lubrication, but, though misfiring badly, it made quite a fast ascent. The engine was a 2¾ overhead valve J.A.P., and was mounted in a racing frame just big enough to surround it. It had no exhaust pipe, and was fitted with a Longuemare carburetter. Its appearance was striking—so was its exhaust.”
Thanks to Dave Richmond for this submission