Latest addition to my key collection. A Western Union “Pole Changer Key”. The name would lead one to think they were used by the guys who climbed the poles and installed the landline wires.
Actually they were not used by the actual pole changers but used in the office to switch between landline wire systems. Example would be switching between a North, South route to an East, West wire.
So changing between the poles sort of speak. Circa around 1900.