The internal great thing about a Tesla Stropkov DS 3600 phone from the early Eighties

It is a DS 3600 analog phone made by Tesla Stropkov in about 1982. It is nonetheless practical and to my thoughts it is completely lovely.

However the inside is simply as pleasant to have a look at:

Sadly, I have never been capable of finding out a lot concerning the WNB 068 part in there. Just a few websites in Czech (or possibly it is Slovak?) consult with it as a “hybrid circuit” and I assume it is each an amplifier and dealing with mixing the microphone and earpiece indicators onto the 2 wire phone circuit. 

Ultimate bonus shot earlier than I put it again collectively: