I've been curious about this... the longevity of G-Shock modules. It always amazes me how many CASIO watches survive across the decades. More than any other digital watch, you can find them all the way back from the 1980's, still able to keep time today. But... often what happens is someone forgets about the watch and it sits for many years with a dead battery, resting... so that one day it can be revived. I've brought back to life quite a few. I often wonder if longevity has anything to do with use... meaning, if you have two DW-5600C's from the 1980's where one has been running since purchased and another was left with a dead battery for a couple of decades, will they both have about the same amount of life left, or will the "Rumpelstiltskin" one have less wear and last longer?
Do you have any older G-Shocks in your collection that have been running steady since the day you got it, discounting the down time for battery changes? If so, for how many years has it been running?