Genuine Casio watch case back rubber gaskets for the following G-Shock models:

GW-200      GW-200BC      GW-200CF      G-200GM

GW-200K      GW-200MS      GW-200RB      GW-200S

GW-200TC      GW-200Z      GW-201NT      GW-202AK

GW-202K      GW-203K      GW-204K      GW-205K

GW-206K      GW-225A      GW-225C      GW-225E