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 bezel with gold-coloured plating and a sapphire crystal glass, this chronograph features a black dial, with hour and minute hands that resemble the original Speedtimer from 1969. With 12 spots of Lumibrite, this timepiece is designed to be legible in darker conditions. With a chronograph second scale around the dial ring, this piece also features a Tachymeter on the bezel for measuring speed – an iconic element of the original Seiko Speedtimer.Featuring a solar-powered V192, this Speedtimer chronograph is accurate to +/- 15 seconds per month, whilst maintaining a full charge of 6 months.Prospex is a combination of the words ‘Professional ‘and ‘Specifications. ‘Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike. MovementAccuracy: -15/+15 seconds per monthCalibre: V192Movement Type: SolarPower Reserve: Operating for approx. 6 months (when fully charged)|||ExteriorDial Colour: BlackLumiBrite: Lumibrite on hands and indexesCase Material: Stainless steelStrap/Bracelet: Stainless steelClasp: Three-fold clasp with push button releaseCase Diameter: 41.4mmCase Thickness: 13.0mmCase Length: 45.9mmLug Width: 21.0mm|||Other SpecificationsWater Resistance: 10 barWeight: 164.0gCrystal Coating: Anti-reflective coating on inner surfaceCrystal Type: Curved sapphire crystalOther Specifications: Screw case back, Tachymeter functionWatch Function: 24-hour hand, Chronograph up to 60 minutes in 1/5 second increments, Date display, Equipped with small seconds hand, Overcharge prevention function, Power reserve indicatorMagnetic Resistance: 4,800 A/m