{"product_id":"seiko-5-sports-6106-8120-kaliber-6106-suwa-seikosha-drehbare-lunette-water-70-proof-september-1968-frisch-revidiert","title":"Seiko 5 Sports 6106-8120 – Caliber 6106, Suwa Seikosha – rotating bezel, \"Water 70 Proof\" – September 1968 – freshly serviced","description":"\u003cp dir=\"ltr\"\u003eA rotating bezel, a dark dial, seventy meters of water resistance, and an automatic movement with day and date.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eIn 1968, this was a remarkable set of features for a watch from the lower third of the Seiko lineup—and the reason the Seiko 5 Sports became the utilitarian watch of an entire generation in Japan.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eWhat the five means\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eSeiko introduced the Seiko 5 in 1963, and the digit was not a model number, but a promise—five features that every watch in the series had to fulfill:\u003c\/p\u003e\n\u003col dir=\"ltr\"\u003e\n\n\u003cli\u003e\u003cstrong\u003eAutomatic winding\u003c\/strong\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eDay and date display\u003c\/strong\u003e in a single window\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003eWater resistance\u003c\/strong\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003eRecessed crown at four o'clock\u003c\/strong\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003eDurable case and movement\u003c\/strong\u003e\u003c\/li\u003e\n\n\n\u003c\/ol\u003e\n\u003cp dir=\"ltr\"\u003eThe fourth point is the one you feel on your wrist. The crown is not located at three o'clock, where it would dig into the back of your hand with every movement, but is recessed at four o'clock. You simply don't notice it anymore—and because it lies deeper in the case, it is better protected against impacts and water ingress.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eWithin the series, the \u003cstrong\u003eSports\u003c\/strong\u003e versions stood for more robust cases and higher water resistance. Here, it is \u003cstrong\u003e70 meters\u003c\/strong\u003e, marked on the dial as \"WATER 70 PROOF\" and on the case back as \"WATER PROOF.\"\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eThe rotating bezel\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eUnlike most Seiko 5 models, this one features an \u003cstrong\u003eexternal rotating bezel\u003c\/strong\u003e with a black insert, a 60-minute scale, and a luminous marker at twelve o'clock.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe benefit is immediate: you set the marker to the minute hand and read off the elapsed time—for dives, parking meters, cooking times, or meetings. It is the simplest auxiliary function a watch can have, and by far the most frequently used.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eTogether with the cushion-shaped case and the 70 meters of resistance, this bezel gives the watch the appearance of a diver's watch, even though Seiko did not market it as one. It is precisely this borderline status that makes the Sports models interesting today: they have the look of the tool watches of those years, without their price tag.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eSuwa and Daini\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThe caliber 6106 originates from the \u003cstrong\u003eSuwa factory\u003c\/strong\u003e, recognizable by the small whirlpool logo on the dial and case back.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eFor decades, Seiko maintained two completely separate production facilities that competed with each other: Suwa Seikosha in Nagano and Daini Seikosha in Tokyo. Suwa developed the Grand Seiko; Daini, the King Seiko. What is rarely mentioned is that the same engineers who worked on the top models also designed the mass-market calibers. The manufacturing discipline required for a Grand Seiko directly benefited the simpler watches.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThis is precisely the reason why a Seiko 5 from 1968 runs reliably again today after a service, while many European watches in the same price range have long since disappeared.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eThe caliber 6106\u003c\/h3\u003e\n\u003cul dir=\"ltr\"\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eAutomatic\u003c\/strong\u003e, 25 jewels as indicated on the dial\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003e21,600 vibrations per hour\u003c\/strong\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eDay and date\u003c\/strong\u003e with quickset\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eBilingual day wheel\u003c\/strong\u003e, Japanese and English\u003c\/li\u003e\n\n\u003cli\u003eManufactured by \u003cstrong\u003eSuwa Seikosha\u003c\/strong\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003eRegarding operation: The 6106 cannot be hand-wound and does not have a hacking function (seconds stop). If the watch has been sitting, you start it by gently swaying it; it will start running after a few seconds. This is not a defect, but a design feature of the series—Seiko deliberately omitted these functions in the Seiko 5 to make the movements simpler and more durable.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eAs with all Seiko movements of this type, the calendar should not be adjusted between approximately 9 p.m. and 3 a.m., as the switching mechanism is already engaged during this period.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eDial and case\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThe dial is finished in a dark anthracite gray that lightens noticeably toward the center and shifts between graphite and almost black depending on the light. It is surrounded by a raised, silver-colored ring with a printed minute track—a stepped construction that gives the watch depth and significantly improves legibility.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe hour markers are applied, luminous-coated batons; at twelve o'clock, there is a wider double index. Additionally, there are hands with luminous channels and a red center seconds hand as the only color accent besides the blue \u003cem\u003eSPORTS\u003c\/em\u003e lettering.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe dial is inscribed with the SEIKO logo and the \u003cstrong\u003e5 shield\u003c\/strong\u003e, below which are \u003cem\u003eSPORTS \/ WATER 70 PROOF \/ 25 JEWELS\u003c\/em\u003e as well as the Suwa symbol.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe stainless steel case is cushion-shaped with lugs that sweep outward. With a diameter of 39.1 mm, a lug-to-lug distance of 42.8 mm, and a height of 11.9 mm, it is sportily proportioned but remains easy to handle on the wrist thanks to the short lugs.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eCondition\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eTechnically flawless. The watch was professionally serviced in Japan in the spring\/summer of 2026—fully disassembled, cleaned, oiled, and regulated. The automatic winding, the quickset for day and date, and the rotating bezel all function perfectly.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe dial is well preserved: the anthracite-colored surface is uniform, the lettering is complete and sharp, the applied indices are firm, the silver ring is undamaged, and the calendar frame is intact.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe luminous material in the indices, hands, and the bezel marker has darkened to a warm cream tone due to age and no longer glows. This is typical for watches of this era.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe stainless steel case shows age-appropriate signs of wear on the bezel, edges, and flanks; the black bezel insert shows scattered marks, but the lettering is fully legible. The case back bears scratches from opening and wearing; all engravings—reference 6106-8120, serial number, Suwa symbol—are complete and clearly legible. The mineral crystal is clear and free of damage.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eIt is mounted on a third-party stainless steel bracelet; this is not the original Seiko band.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul dir=\"ltr\"\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eBrand \/ Line:\u003c\/strong\u003e Seiko 5 Sports\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e 6106-8120\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eSerial number:\u003c\/strong\u003e 892532\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eProduction date:\u003c\/strong\u003e September 1968\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eMovement:\u003c\/strong\u003e Seiko caliber 6106, automatic without hand-winding, 25 jewels, 21,600 vph\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Suwa Seikosha, Japan\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Hours, minutes, center seconds, day and date with quickset, bilingual day wheel (Japanese\/English), rotating bezel\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e Stainless steel, cushion shape, recessed crown at four o'clock, case back with \"WATER PROOF\" marking\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eDiameter (excluding crown):\u003c\/strong\u003e 39.1 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 11.9 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eLug-to-lug:\u003c\/strong\u003e 42.8 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eLug width:\u003c\/strong\u003e 19 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eWeight (incl. band):\u003c\/strong\u003e 103 g\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eBand:\u003c\/strong\u003e Third-party stainless steel bracelet\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e Mineral crystal\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cstrong\u003eService:\u003c\/strong\u003e Spring\/summer 2026, Japan – full disassembly, cleaning, oiling, regulation\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 dir=\"ltr\"\u003eFor whom\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eFor anyone who likes the look of a vintage diver's watch without paying the price. Rotating bezel, cushion-shaped case, dark dial, 70 meters—the Seiko 5 Sports has everything that characterizes the sought-after tool watches of those years. The gray dial distinguishes it from the common black versions and looks significantly more vibrant in the light.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eFor those starting a mechanical Seiko collection: it contains the same movement from the same Suwa production as the significantly more expensive Lord Matic, in a case that you can wear rather than pamper.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eAnd for anyone looking for a watch with a function they actually use. A rotating bezel needs no explanation—you set it to the minute hand and you know where you stand.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWarranty (pre-owned)\u003c\/strong\u003e\u003cbr\u003eThis is a pre-owned item. The limitation period for claims for defects (statutory warranty) is 12 months from delivery.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eNote\u003c\/strong\u003e\u003cbr\u003eAs this is a vintage watch, no water resistance can be guaranteed. To protect the movement, the watch should not come into contact with water or moisture.\u003c\/p\u003e","brand":"Vintage \u0026 JDM (Japan Domestic Market)","offers":[{"title":"Default Title","offer_id":54784087097682,"sku":"A514","price":469.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/923C252E-0336-4819-A027-10D5609A01BC.jpg?v=1789920052","url":"https:\/\/japanese-microbrands.com\/en\/products\/seiko-5-sports-6106-8120-kaliber-6106-suwa-seikosha-drehbare-lunette-water-70-proof-september-1968-frisch-revidiert","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}