Elaborate extension block

[Pieoftheday]

286632866428665 I found this whilst dismantling the back bedroom for a refurb, it looks like an extension block where you wire all your devices into the block instead of plugging them in, I have no idea where it's from,what's the point in it?

[guy]

I think it is a Bulgin IEC connector - from memory, just a small form mains connection, to save space. Amplifiers used to have them on the back panel so that you could plug in a tuner (or similar) for mains supply without having to have lots of mains sockets in the wall (popular 1970's?)