Replacement antique doorbell buttons
I have a NOS (new old stock) door bell plate with two buttons and name tags for a century-old house that has been converted into two units (owner/landlord and tenant). It is from about 1920, is all metal and works but there's a problem.
Depending on how it is wired, either the plate is always live or becomes live when one of the buttons is pushed (and in that configuration both door bells ring).
I've been unable to find replacement buttons for it. The button is threaded, sticks through a 15 mm (19/32") hole and screws into the back shell.
I am trying to find, ideally, replacement buttons that are silver coloured and high quality. Here are some pictures. Any help?
Front of door bell:
Back of door bell:
Door bell button unscrewed:
Door bell button alone: