That drawing is marked "WNB 067" ... previous iteration maybe?

the two wires to the handset and 4 to the dial confuse me there, too. IIRC its the other way around, isn't it?

No, it matches the picture: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj...

Handset being the 2 conductor wire exiting the picture on the right/middle.

Note the '/ 068' behind it!

Yes. Not seen in my photos is that behind the WNB 068 printed on the PCB is WNB 067.