Inherited Thorlux PL bulkhead geartray

I posted this sometime ago on one of the Facebook groups, it was a real surprise to find this installed at the house that I bought earlier this year, installed over the front door. I didn't notice it when I was viewing the house, just noticed a switch next to the front door on moving in and switched it on and this light lit up over the door! I'd never seen one of these before! It's still there now and will stay there! Finally got round to cleaning it and photographing the gear tray a few weeks ago. It's dated 1993. Wonder how this fitting came to be installed in a house, it looks quite industrial.