I often come across the weird (to U.K.) and wonderful on my travels. Last night in a venue in Romania I found these interesting specimens which another knowledge space has decided are DIN56905 from the 70's, common for Eastern Europe / Communist block. Basically a universally polarised connector so it didn't matter which way you laid the cable. The other fascinating thing about that venue were the bullet holes that pock-marked the outside of it from top to toe from the '89 uprising!!
Pics in next box as they're on my phone....
Pics in next box as they're on my phone....