Ha, small world.
I'm not sure when my car was last on the road. Sadly the original log book for my car got lost in the mists of time, and I only ever had the V5 document which dated from 1983 onwards. Enquiries with the DVLA and local authorities where the car was registered never turned up anything, so i think the cars original owners will always remain a mystery.
I estimate my car was taken off the road sometime in the late sixties or early seventies. It still had original seat covering and paint, and i think cars which were kept on the road later than this tended to have these items overhauled.
So I'm guessing that the lights were fitted sometime in the 1960's.