This timepiece is a magnificent artifact from September 1970, as confirmed by the serial number 094210. As an expert in horology, I can tell you this Daini-division masterpiece houses the legendary Caliber 7017, which at its launch held the world record for the thinnest automatic chronograph movement. Known as the "Eyeless" Speed-Timer because it lacks traditional sub-dials, it utilizes a clean, three-hand design where the orange center hand serves both as the sweeping seconds and the chronograph timer. It features a sophisticated flyback complication, allowing for an instantaneous reset and restart of the timer with a single press a technical soul designed for precision racing.

The architecture is quintessentially sharp, utilizing a heavy stainless steel cushion case with a high-contrast tachymeter and pulsometer internal scale. The deep blue dial is a work of high-end JDM art, featuring a vertical Kanji/English day-date display and the iconic "5 Sports" and "Speed-Timer" branding. Flipping the watch over reveals the Daini lightning bolt logo, definitively confirming its status as a top-tier professional-grade instrument from the golden era of Seiko’s mechanical innovation.