Seiko Prospex Speedtimer 42mm Quartz Chronograph Watch SFJ001P1 Secondary Gemstone Type_Created Emerald The blue sunburst dial is The blue sunburst dial is encircled by a tachymeter fixed bezel with large black numerals with matching blue flange indicating minutes and seconds while the see through case back gives you a glimpse of the movement working inside The brand new calibre 8A50 ensures that this Seiko Prospex Speedtimer 42mm Quartz Chronograph Watch SFJ001P1 offers unparalleled performance and reliability With its overcharge prevention function and chronograph capabilities up to 60 minutes in 1 100 second increments