A few people on the original forum think they're off some sort of trailer too, but apparently most trailer lights are on two screws? I agree, they don't really look like car headlights.
Could be anything coachbuilt really - van, campervan, minibus. Had a look through a couple of catalogues for aftermarket lights, but don't see anything that matches.
From my recollection, they are simply aftermarket lights often used on trailers etc. Having four screws just means they were probably better built and more expensive.
They do look like VW Beetle rear lights actually, never crossed my mind! But looking at the below picture it seems that the Beetle lights are slightly different. Seems like these lights are probably off some sort of trailer/caravan.
Turns out someone else asked on another forum and the it seems they're L713 Lamps made by CAV(Lucas),as fitted to AEC, Atkinson and other lorries of the late 60s and 70s.
Turns out someone else asked on another forum and the it seems they're L713 Lamps made by CAV(Lucas),as fitted to AEC, Atkinson and other lorries of the late 60s and 70s.
Damn. I was just going to day that but you beat me to it.