The Speedtimer Prospex watch collection represents Seikos professional timekeeping heritage and takes inspiration from the brands innovative history. This particular limited-edition design is powered by a new in-house solar chronograph calibre equipped with a stopwatch which measures time to the nearest 1/100th of a second. Its limited edition run of just 4, 000 pieces worldwide commemorates the 40th anniversary of Seikos world-first analogue quartz chronograph, the 7A28, from 1983. Its shares the same black bezel, and khaki-grey dial colour as the first 1/100th second chronograph from 1992. It features a similar bracelet to the original, with its recognisable black strip through the centre. Becoming official timekeeper for Tokyos 1964 Olympics was a turning point in Seikos history when the brand began making precisely accurate professional sports timing instruments, with no prior experience. This legacy continues today as Seiko is the World Athletics Official Timekeeper since 198