Not sure what you guys mean by a clock? Are you lterally meaning clock (tick tock)? If so, completely wrong
View attachment 30517
They were always sold and used as clock connectors.
Never seen a double pole one though.
Hmm. Well we were wrong then.
Clock connection unit is just a special type of fused plug and socket. It has a flex outlet in the bit you unplug, which I assumed was present, but not visible in the original pic.
So it's just an early type of FCU (both poles)?