Seals
If this was a Perma-Tuff machine I would buy it without hesitation as the only seals that could theoretically become brittle are the heater washers, sump boot, drain solenoid shaft and spray arm assembly- the sump boot and pump mechanism I would change anyway to the new style (as both wash and rinse better). Heater is a 5 minute fix. The spray arm hub and wash arm are plentiful in the new style and easy to replace worse case scenario. Plus it would give me an excuse to use a new style lower rack.
The Hotpoint versions however has rubber washers around 8 large tank screws, the upper rack wheels, timer (dumb idea), baffle, vent, detergent cup, fill flume, rinse aid, and several other components I'm probably forgetting going through the porcelain tank.
I remember when the apartments around discarded these dishwashers after 20-30 years of use, universally there was rust and scale around at least a few of these poke throughs, the timer often being the worst and most common offender.
If anything leaks here, I am not sure as to how to fix it.