Replaced my GGB-100-1b with this this monster (GWG-1000-1A3). I think I got a Japanese version, because I can't read the manual. : r/gshock
How To Adjust Casio Gshock GWG-1000-1A9 Manual Setting GWG1000 MUDMASTER English Subtitle - YouTube
CASIO G-SHOCK MUDMASTER GWG-1000-1A3JF MADE IN JAPAN JDM – japan-select
Authenticated Used Casio Men's Watch G-Shock Madmaster GWG-1000-1A3JF Black Dial Arabic Numeral Index Stainless Steel Resin Tough Solar with Replacement Bezel CASIO - Walmart.com
Casio G-Shock Carbon Mudmaster Carbon Core Guard Watch GWG-2000-1A1ER - First Class Watches™ USA