He probably fished it out of the scrap bin when his gaffer wanted rid of it.
Strictly speaking it's kind of his place. He originally owned it then in the early 90's a multi national company bought it so they had a toolmaker for their operations in the UK. They have kept him running it ever since.
TBH he probably picked it up from a machine shop at some point that was getting rid of kit. Though maybe they had it stored somewhere and realised it was time to clear the storage area.