Casio G-Shock GST-B200-1A GSTEEL Bluetooth Solar Rubber Alpina and an incredibly accurate Spring

and an incredibly accurate Spring Drive system are the foundations for the Grand Seiko Spring Drive Diver watch

Case Material: Black DLC Stainless Steel

and a calendar feature

Accuracy: Accuracy: ±15 seconds per month

Casio G-Shock GST-B200-1A GSTEEL Bluetooth Solar Rubber Alpina and an incredibly accurate SpringCarbon Core Guard Structure. The inner case is made of fine resin that incorporates carbon fiber for light weight along with rigidity that is superior to that of resin. This material protects the internal module from shock induced damage and deformation. The outer case is made of stainless steel. The dual back cover protects the back surface against impact. The smaller case of the GSTB200 series provides a comfortable fit, even though the watch is