Seiko Prospex SPB453 20MAS 1965 Heritage Diver 300m Black Dial Automatic Casio G-Shock G-Steel Blue Note Limited Edition GSTB100BNR-1A domed sapphire crystal with anti-reflective

domed sapphire crystal with anti-reflective coating

display your exercise intensity in the form of your heart rate zone over different levels

One-touch easy access to compass and temperature readings

When paired with your compatible smartphone3

27 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)

Seiko Prospex SPB453 20MAS 1965 Heritage Diver 300m Black Dial Automatic Casio G-Shock G-Steel Blue Note Limited Edition GSTB100BNR-1A domed sapphire crystal with anti-reflectiveIn the years since it released its first diver's watch in 1965, Seiko has developed new technologies, features, and designs that have won the favour of professional and recreational divers the world over. Through more than a half century of innovation, the company has continuously pushed back the boundaries of where sports watches, and diver's watches in particular, can go and how they can be used. Continuous enhancements in safety, reliability,