Seiko Prospex Speedtimer Solar Chronograph SSC931 21 jewels and a tri-fold push button

and a tri-fold push button release clasp

visible through a screwdown

the dial includes a date calendar

Prospex Special Edition

Seiko Prospex Speedtimer Solar Chronograph SSC931 21 jewels and a tri-fold push buttonProspex Speedtimer Solar Chronograph U. S. Special Edition. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and style. With vibrant colors inspired by vintage racing cars, this exciting Special Edition celebrates the 1969 Speedtimer, the worlds first self winding chronograph. The chronograph function measures up to 60 minutes of elapsed time in 1 5 second