Here is another unique and attractive go-with. It is a metal encased Western Union telegraph relay. The metal case has a small glass window with a door that opens. On top are two adjusting knobs for setting the sensitivity. Asking $40 plus shipping.

Shipping will be at actual cost (now using PirateShip to reduce shipping costs). I will combine shipping on multiple purchases where practical. I accept PayPal – Friends & Family, money orders, or checks.