Casio G-Shock GST-B400-1AER upsell The prototype of the world's

The prototype of the world's first electric wristwatch was presented in 1952 at the Paris Academy of Sciences

in millions of copies

ruggedness and elegance

ultra-resistant black carbon resin case

Old Smith 90-001

Casio G-Shock GST-B400-1AER upsell The prototype of the world'sThe G STEEL series is expanding with the new GST B400 models! The new, enhanced design is made possible by a slim module and a carbon reinforced stainless steel case. The GST B400 features increased miniaturization of components and a reduction in module size without compromising Bluetooth or solar functionality. Power consumption has also been significantly optimized. Furthermore, this model is the slimmest in the G STEEL series thanks to its carbon