The Seiko Speedtimer, introduced in 1969, was a milestone in chronograph innovation. Inspired by the fashion, music, and motorsports of the 70s, the 'Grand Touring' Speedtimer evokes vintage muscle cars. This timepiece features a navy-blue aluminium bezel, sapphire crystal glass, and a grey dial with hands reminiscent of the original Speedtimer. It has 12 spots of Lumibrite for legibility in low light, a chronograph second scale, and a tachymeter bezel for speed measurement. Powered by the solar V192 movement, it offers accuracy to +/- 15 seconds per month and a 6-month power reserve. Prospex, a combination of 'Professional' and 'Specifications,' delivers practical, reliable, and durable timepieces for extreme environments. This solar-powered chronograph is part of the Prospex Speedtimer collection, highlighting Seiko’s professional timekeeping heritage. The watch features an increased case size of 41.4mm. The grey sunray dial has an iridescent metallic character, with three black sub-dials displaying additional functions. It includes a 60-minute chronograph function timing to 1/5th of a second with split time recording, and a separate 24-hour sub-dial at the 3 o’clock position. A power reserve indicator is at the 6 o’clock sub-dial, and a date window is below the 4 o’clock marker. Both hands and hour indexes are coated in Lumibrite for easy reading in dim conditions. The tachymeter bezel frames the dial and can be used to record speed over distance. The watch is fitted with an ultra-scratch resistant curved sapphire glass with an anti-reflective coating for superior dial clarity. It is also water-resistant to 100m, suitable for general water sports. The solid stainless steel bracelet is tapered for comfort and secured with a push-button tri-fold clasp. Built to last and backed by a 2-year guarantee, this watch offers a lifetime of reliable service. Prospex timepieces are practical, reliable, and durable for extreme or everyday environments, appealing to sports lovers and adventure seekers.