The clock in my ’79 Porsche 911 works perfectly. I don’t remember the last time I set it. Maybe I made a small adjustment six months ago, a year ago, don’t know? A modern day quartz clock does this no problem, a mechanical spring clock might struggle in such a rough environment. So was it quartz or mechanical? the ’70s was when quartz came on the scene, so either was a possibility. First I wanted to find out if it was ever replaced or serviced. So what did I do? I contacted the previous two owners. One purchased it new in ’79 and the other owned it for a five year period before I bought it. Neither recalls it ever being serviced or having a problem.
