This is a really fine new old stock Lucas HC13 bicycle headlamp. We are guessing it was made in the 1950s or early 1960s. It is a small unit, suitable for a lightweight or club machine.
It is in outstanding original condition, with no fading, cracks or yellowing to the lens, beautiful chrome and reflector, and the terminal even retains its original red protective cap.
We have never seen another quite like it. It would be a lovely period accessory to any British or European bicycle, Raleigh, Rudge, Robin Hood, Dunelt, Chater Lea, Record Ace, Clubman, Humber, Triumph, BSA, Claud Butler, Hetchins, Lenton, Hercules, to name a few.