A. J. Stevens & Co. Ltd was a British automobile and motorcycle manufacturer in operation from 1909 to 1931. The company was founded by Joe Stevens in Wolverhampton, England. After the firm was sold, the name continued to be used by Matchless, Associated Motorcycles, and Norton-Villiers on four-stroke motorcycles till 1969, and since the name’s resale in 1974, on lightweight, two-stroke scramblers and today on small-capacity roadsters and cruisers. The company held 117 motorcycle world records.
https://en.wikipedia.org/wiki/AJS

The core engine was acquired in the United Kingdom. The parts needed to make it a complete engine came from Austria, Australia, Belgium, Canada, France, the UK, and the USA. Other miscellaneous parts were sourced in countries not mentioned above.
1921-1924 AJS 2.75 HP Parts List
1922 AJS Sales Brochure
1922 AJS Singles How to Manage Them
AJS 1921-1922 Models