Prospex Speedtimer 'Circuit Race'Introduced in 1969, the Seiko Speedtimer was a major milestone in chronograph innovation, and marked the beginning of an important decade of the Speedtimer in its prime. The 70s were famed for many things: fashion, music, but also motorsports. Designed under the theme of Classic Motorsports, the Circuit Race Speedtimer is inspired by vintage circuit racing when cars would rally with extraordinary speed and excitement. Encased in a black aluminium