Yes, it wasn't all that uncommon back in the day with mechanical voltage regulators
For reference I just measured 14.4v at the battery, engine running and have been on the road for about 4 hours and no hint of battery heating up.
I'd be surprised if there wasn't at least a code set or light for overvoltage if not even some kind of overvoltage protection with a relay or the like.
I think the battery was overcharging because some of the plates got shorted and the voltage was too high for the remaining ones.