6 old Britmac round 3 pin sockets,
these were found during a garage clearance, suspect they're 1950s,
sadly don't know much about them, other than that they're cast iron and look to be complete, a couple have 2 conduit entry holes (one at the side and one at the top, guess if you just needed the one entry you could blank off the other), the rest just have one at the top.