Casio solar powered G shock. Last one lasted almost 10 yrs before the battery finally would not charge. Have two, a $40 cheapy - time/date, not much else I use. Does not self regulate. $200 one I got at Sam's on sale, lots of bells and whistles, best part it does the self regulation on time. Have a Seiko divers watch, bought in 79. Need to get it serviced I guess. 2d band.