The several threads debating quartz vs. mechanical movements have me curious... because one of the claims made against quartz watches is that if the circuitry fails in any way, it's toast--you either replace the entire movement or get another watch. I do have to believe in very high end quartz watches that some electronics expert could solder in a replacement IC unit, but in the end it is probably cheaper just to replace the whole circuit board. On the other hand, the mechanical watch provides full access to all of its parts and the expert watch repair technician can virtually fix "any" mechanical watch.
So, I'm sure many people here have witnessed quartz watches venturing into 50 year territory still working just fine... but I wonder. Is that more of the exception to the rule, or the norm? Do the higher quality quartz watches just keep on going?
And ultimately, what's the longest running quartz watch known at this point?