Seiko King Seiko Chronometer 5625-7040 (1971)

Presented for auction by Second Vintage This Chronometer-certified King Seiko features a striking dark dial, representing a sought-after configuration for collectors of early 1970s Japanese horology. Preserved with sharp case geometry and an intact gold KS medallion, this reference 5625-7040 combines a highly regarded hi-beat automatic movement with a distinct visual presence. Brand: Seiko Model: King Seiko Chronometer Reference Number: 5625-7040 Serial Number: 100164 Movement: Caliber 5625 automatic Dial: Dark blue/grey sunburst Case Size: 36 mm (excluding the crown) Case Material: Stainless steel Production Year: 1971 Condition: Excellent vintage condition. Movement serviced on 16 October 2026. Timegrapher: +9+12s/day, performing remarkably well. Dial and Hands The exceptionally clean dial features a stunning dark blue and grey sunburst finish, a sought-after variation that shifts beautifully under the light. Applied indices and crisp printing, including the "CHRONOMETER OFFICIALLY CERTIFIED" text and the Suwa symbol, highlight the precision of the dial design. There are no visible flaws across the surface. The polished dauphine style hands showcase a black central stripe and clean surfaces, demonstrating excellent preservation. Case and Crystal The stainless steel case is in well-preserved vintage condition, retaining sharp geometry with distinct transitions between the brushed lug tops and polished flanks. Light surface scratches are present, consistent with careful wear over the decades. The smooth polished bezel displays only light wear. The caseback is distinguished by its intact gold KS medallion, a notable feature of early 5625-7040 examples. The watch is fitted with a flat mineral crystal featuring a beveled edge, remaining clear with no significant scratches. A knurled crown, signed KS, completes the case profile. Movement Powering the watch is the caliber 5625, an automatic hi-beat movement operating at 28,800 beats per hour. Timegrapher results show +9+12s/day. Exhibiting remarkable accuracy and consistency, performing brilliantly for a vintage timepiece. The movement was serviced on 16 October 2026. Strap The watch is fitted with a black leather strap featuring a crocodile pattern. The strap shows light wear and pairs elegantly with the dark dial. Condition Excellent vintage condition. The movement was serviced on 16 October 2026 and, supported by the recorded timegrapher result, is performing very strongly. The sharp case retains its distinct finishing and gold medallion, with only light surface scratches present. The dial and hands are exceptionally clean with no visible flaws. The crystal is clear, and the smooth bezel shows minimal wear. Dimensions The case size is 36 mm (excluding the crown). Remarks This King Seiko offers a sought-after combination of a chronometer-certified hi-beat movement and a stunning dark sunburst dial. The presence of the intact gold caseback medallion and sharp case geometry make this a superb collector piece. History The King Seiko 56KS series was introduced by Suwa Seikosha as a luxury watch line, produced from 1968 to 1975. The reference 5625-7040 is known for its well-proportioned fixed case back construction and high-frequency 28,800 bph movement. Early examples of this reference were fitted with a gold medallion on the caseback, a premium detail that was phased out around 1972. Today, these chronometer-certified models remain highly regarded by enthusiasts of vintage Japanese watchmaking. / Second Vintage SKU: SEI-CKH-0002