With a multimeter and and some time I was able to find the following structure:

It looks like a gigantic Diode-AND gate. The diodes have a common anode. I couldn´t find any isolated diodes or transistors.

What else could it be? Maybe a clock distribution circuit where the clock is decoupled by diodes? Or was it used for driving core memory? I don´t know.

However, I will stop the reverse engineering here, as it´s already enough in the circuit to be used in the clock. I will use the AND structure to flip the clock from 59 to 00.