It's an HP DeskJet 520, and it was manufactured in April 1994. It has a parallel interface (but no cable) and a 240V power supply with a UK plug on it.
It's not very good at picking the paper up out of the paper tray. In fact, you have to give the top sheet a little push with your fingers whenever you send something to print. It's black-and-white only. It's not terribly fast.
In short, it's not terribly good. But it works, sort of -- and it's free.
Does anyone want it? We'd have to think of a way of getting it from me to you without me spending any money.