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Casio G-Shock GG-B100-1A3 vs. Seiko Prospex SRPA21K1
Clock face
Black
Black, Blue, Red, Silver
Colour of bracelet
Black, Grey, Green
Blue, Silver
Type of hands
Analogue (clockwork), Digital
Analogue (clockwork)
Thickness
19 mm
13.4 mm
Width
53 mm
45 mm
Features
Date display, Chronograph, Timer, World time, Shock resistant, Barometer, Bluetooth, Stopwatch, Alarm, Luminescent, Compass
Date display, Luminescent, Rotating bezel
Water resistance (max depth)
200 m
200 m
Water resistance (max pressure)
20 ATM
20 ATM
Bracelet (material)
Resin Band, Rubber, Gold, Silicone
Steel, Silver
Case
Plastic / Synthetic
Silver, Stainless steel, Aluminum
Type of glass
Mineral glass
Mineral glass
Primary power source
Battery
Automatic