Look at these videos:
Nice to see the face of the designers!
Also I learned something new, I always thought the DW-6600 was the G-Shock with the longest run in production, but apparently it is the AW-500 series that has been available for 20 years since 1989.
Also the plus/cross sign on the Gulfman buttons apparently is there to remind you of a life boat protector storage case that is often marked with such a cross symbol. And since the G-Shock case is there to protect the "life" of the module inside, its a great symbolism.
There is always something new to be learned about G-shocks!