Casio Tough Solar G-Shock (2012). Zero maintenance. Always charged and synced to the atomic clock daily. Has been in two oceans and countless baths of my children. : r/BuyItForLife
First gen. AWG-101/100 G-Shock watch | A popular solar atomic ana-digi model - YouTube
Casio G-Shock Module No. 4765-Black | #282059550
Casio 4765 : User manual
Casio GSHOCK AWGM100B-1A REVIEW | How To Set Time | LIGHT DISPLAY - YouTube