Seiko - Speed-Timer Chronograph 流光 (Ryūkō) – Flowing Light - 6139-8040 - Men - 1977

Offered in this auction by Second Vintage This is a remarkable example of the highly collectible Seiko Speed-Timer, a distinct variation of the legendary 6139 automatic chronograph series produced for the Japanese Domestic Market. Featuring a vibrant electric blue sunburst dial paired with a contrasting teal sub-register and a striking orange chronograph hand, this timepiece captures the bold aesthetic of 1970s motorsport design. It is powered by the robust 21-jewel Caliber 6139B, historically significant as one of the world's first automatic chronograph movements. Brand: Seiko Model: Speed-Timer Chronograph Reference Number: 6139-8040 Serial Number: 737572 Movement: Automatic Caliber 6139B Dial: Electric blue sunburst with teal sub-register Case Size: 39 mm (excluding the crown) Case Material: Stainless Steel Production Year: 1977 Condition: Good vintage condition. The watch presents an honest and original appearance with visible signs of wear to the case consistent with its age, while the dial remains in exceptionally attractive condition. Timegrapher results confirm the movement is operational. Dial and Hands The dial is the highlight of this timepiece, featuring a stunning electric blue sunburst finish that plays beautifully with the light. It is accented by a teal green minute recording sub-dial at the six o'clock position and a bright orange chronograph sweep hand. The applied silver indices and hands are in very good condition, maintaining a sharp and legible appearance. A day-date window is positioned at three o'clock, framed in steel. The dial text remains crisp, featuring the desirable "Speed-Timer" branding unique to JDM models. Case and Crystal The stainless steel case measures 39mm in diameter and retains its distinctive vintage profile. The case shows honest signs of use, with surface scratches and marks throughout that attest to its history and age, yet the edges remain defined. The pushers and crown are original and integrated well into the case design. The crystal is clear, allowing for an unobstructed view of the vibrant dial beneath. Movement Powering this chronograph is the renowned Seiko Caliber 6139B, a column-wheel vertical clutch automatic movement featuring 21 jewels, a higher count typical of domestic market versions. Timegrapher testing indicates a daily rate of approximately -56 to -62 seconds per day, which indicates a functioning movement offering reliable vintage performance. The chronograph functions start, stop, and reset as intended. Strap The watch is fitted with a stainless steel bracelet featuring a deployant clasp signed with the "Seiko Speed-Timer" logo, completing the authentic vintage look. The bracelet fits a wrist size of approximately 17.5 cm and shows wear consistent with the watch case. Condition This timepiece is in good vintage condition. While the steel case and bracelet show visible scratches and signs of wear commensurate with a tool watch from the 1970s, the dial remains remarkably well-preserved and attractive. The watch runs and functions, presenting as a genuine and honest example of a classic Seiko chronograph. Dimensions The case measures 39 mm in diameter excluding the crown, offering a comfortable and sporty presence on the wrist typical of the era's chronograph design language. Remarks This specific reference, the 6139-8040, is celebrated for its cohesive design and the reliability of its 21-jewel movement. The combination of the "Speed-Timer" signature and the colorful dial configuration makes this a highly sought-after piece for collectors of vintage Japanese horology. History Seiko revolutionized the watch industry in 1969 with the introduction of the 6139 caliber, arguably the first automatic chronograph to reach the consumer market. The Speed-Timer line was marketed specifically in Japan, offering higher jewel counts and sportier designs than their international counterparts. These watches have since gained a cult following for their historical importance, durability, and timeless 1970s style. / Second Vintage SKU: SEI-SSX-0005