Does anybody have a wiring diagram for a Tesla BS23 telephone?
Thanks
If no other answer comes you might contact this czech collector:
https://www.telefonium.cz/telefonní-přístroje-aut-úb.php (https://www.telefonium.cz/telefonn%C3%AD-př%C3%ADstroje-aut-%C3%BAb.php) (scroll down)
The Chrome browser will translate the page.
I speak Czech :) - Amazing website!