OK - the 'Supreme' came later - was founded by bicycle manufacturer Humphries & Dawes Limited, of Birmingham. The company experimented with powered two-wheelers in the early years of the 20th Century before exhibiting a Precision-engined three-model range in 1911. Immediately after The Great War, two-stroke lightweights powered by Villiers or Union engines were added and in 1921 the Junior model adopted OK's own engine, though the latter was in all probability merely a re-badged Union. Charles Dawes and Ernie Humphries split in 1926, the latter continuing motorcycle production using the name 'OK-Supreme'.

This particular OK Junior was found in a Norfolk barn in original condition and restored over a period of three years by a retired engineer. It retains its original engine and is said to run extremely well having covered only circa 100 miles since restoration. Although the original registration number was still on the machine when discovered, there was no tax disc or RF60 logbook to support its retention and hence it has been issued with an age-related number. The machine is offered with Swansea V5C registration document and is taxed/MoT'd to 2011.