GN-1000B-1AER Casio G-Shock Gulfmaster Tide Graph Watch,GWN-1000B-1BER | GWN-1000B-1B | Casio Gulfmaster,GWN-1000B-1BJF Casio G-Shock,CASIO G-SHOCK GULFMASTER GWN-1000B-1BJF Blue Black Solar Men's Watch New in Box | eBay,CASIO G-SHOCK GULFMASTER GWN-1000B-1BJF Blue Black Solar Men's Watch New in Box | eBay