Help me identify this Zenith?

[dieseljeep]

Originally Posted by Electronic M

I've got a very similar 1971 model (cabinet was called the Boyden) with the 12B13C52 chassis. Same number of tubes. The chassis is ~half discrete transistor solid state, with the chroma demod being a DIP IC on a lone duramodule board similar to those used in their SS sets. Very good sets.

This set is missing the hue knob and it's hole so my guess is that it is an export PAL model.

I knew that the control panel looked a little different.
I wonder if the sets came from the factory as a PAL version. The set is old enough that the PAL system was around for awhile.