Rediscovering Iconic Innovation: Seiko Prospex Speedtimer Solar Chronograph

The world’s first self-timing watch, reinvented with innovative solar technology

The Seiko Prospex Speedtimer Solar Chronograph SSC915 is a modern reinterpretation of the iconic Seiko Caliber 6139 "Speedtimer" introduced in 1969. The original Speedtimer was a landmark achievement in watchmaking history, being the world's first automatic chronograph with a vertical clutch and column wheel mechanism. It quickly gained popularity for its reliability, accuracy, and innovative features.

During the late 1960s and early 1970s, Seiko was at the forefront of technological innovation in the watch industry. The company's engineers worked tirelessly to develop cutting-edge movements and timepieces that pushed the boundaries of what was possible. The Caliber 6139 "Speedtimer" was a shining example of this commitment to excellence.

One of the most notable features of the original Speedtimer was its distinctive "panda" dial configuration, with contrasting subdials against a white or black main dial. This design not only enhanced legibility but also gave the watch a sporty and dynamic appearance that appealed to racing enthusiasts and adventurers alike.

The Speedtimer gained further recognition when it was chosen by NASA astronaut Colonel William Pogue to accompany him on the Skylab 4 mission in 1973. Pogue wore his personal Seiko 6139 chronograph throughout the mission, making it the first automatic chronograph to be worn in space. This historic achievement solidified Seiko's reputation as a pioneer in the field of horology.

Today, the Seiko Prospex Speedtimer Solar Chronograph SSC915 pays tribute to the legacy of the original Speedtimer while incorporating modern advancements in watchmaking technology. The use of solar-powered movement ensures reliable and eco-friendly operation, while the contemporary design elements and high-quality materials make it a worthy successor to its legendary predecessor.

With its rich heritage and innovative features, the Seiko Prospex Speedtimer Solar Chronograph SSC915 continues to captivate watch enthusiasts and collectors around the world, cementing its status as a timeless icon in the realm of horology.

Features

• Solar chronograph inspired by Seiko’s 1969 Speedtimer, one of the world’s first automatic chronographs
• Solar technology powers the battery, charging when exposed to light as you wear it
• Once charged, the battery has a 6-month power reserve
• Design pays tribute to the archival model with a two-tone black and red aluminum tachymeter bezel
• Seconds marker positioned on the dial ring for a clearer read and cleaner-looking dial
• Hands and markers treated with LumiBrite for low-light visibility
• Slightly larger case size and anti-reflective sapphire crystal for superior legibility
• Tapered three-link bracelet with tri-fold push button release clasp for easy on and off
• Measures up to 60 minutes of elapsed time in ?-second increments and includes split-time functionality
• Black dial features a 24-hour indicator, power reserve indicator, date calendar, and red chronograph hand
• Stainless steel construction offers the top tier in durability
• Screwdown case back is highly secure
• Water resistant up to 100M (330 feet)

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