During the first half of the 20th century, Sir W. G. Armstrong Whitworth & Co Ltd. was a very important and influential British engineering company. They were remarkable not only for the quality of what they produced, but also its variety: massive guns and forgings of all types, battleships, railway engines, aircraft, cars and machine tools. However, whilst they constructed many massive, special-purpose lathes (many to make battleship guns) smaller versions could only have been of minor interest to them. Today, any machine tool marked Armstrong Whitworth is very rare indeed - and few are known to have survived.
If you have an Armstrong Whitworth lathe, the writer would be interested to hear from you.