This is a cable end for a vintage Servosound sound system.
You will need to order 2 of this item if you want to build a full functional cable (all included parts can either be used for the male and female connectors).
You will have to add the metal connectors (copper for ex.), an electric cable with 6 distinct wires and do some soldering by yourself.
For more informations on the design process please see
here.