This timepiece is a magnificent artifact from December 1975, as confirmed by the serial number 5D0648. Known affectionately by collectors as the "Blue Eye" or "Sunrise," this Seiko 6139-7060 is a legendary piece of horological history. It houses the Caliber 6139, which was one of the world's first automatic chronograph movements and famously the first automatic chronograph to be worn in space. As an enthusiast, you'll love the technical soul of this movement: it utilizes a Column Wheel and Vertical Clutch architecture, high-end features that ensure a smooth, precise "snap" when operating the pushers.
The architecture is quintessentially bold, utilizing a "helmet-style" silhouette with hidden lugs that creates a seamless flow onto the original Seiko Speed-Timer stainless steel bracelet. The dial is a work of high-end JDM art, featuring a vibrant sunburst teal/emerald finish that shifts dramatically in the light, contrasted by a deep black internal rotating bezel. Flipping the watch over reveals the Suwa lightning bolt logo and the "Water Resistant" designation, definitively confirming its authentic Japanese Domestic Market (JDM) heritage—complete with the iconic English/Kanji day wheel.
