{"product_id":"king-seiko-5625-7121-hi-beat-marz-1973-cal-5625-25-jewels-28-800-a-h-2026-revidiert","title":"King Seiko 5625-7121 Hi-Beat – March 1973 – Cal. 5625, 25 Jewels, 28,800 A\/h – Serviced 2026","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eKing Seiko is the name under which Seiko’s Daini factory competed against its own Grand Seiko for decades – and, for the most part, remained on par. This example of the 56KS series offered here is the final and technically most mature development stage of this line: Hi-Beat automatic with 28,800 vibrations per hour, 25 jewels, and date, serviced in Japan with workshop documentation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eThe Two Kingdoms\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eIn the 1960s and 1970s, Seiko maintained two competing watch factories: Suwa Seikosha and Daini Seikosha. Both developed independently, both built top-tier models, and both competed internally against each other – a rivalry that propelled Seiko to the global forefront during that era. Grand Seiko and King Seiko are the visible result of this competition.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eKing Seiko was never the weaker line, but rather the alternative one: the same standards for accuracy and craftsmanship, a different design approach, and noticeably more accessible in price. For collectors today, this is exactly what makes the line interesting – you receive the manufacturing quality of Seiko’s top tier without paying Grand Seiko price levels.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eThe Caliber 5625\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe 56 platform is Seiko’s most mature automatic construction of that era. The caliber 5625 operates with 25 jewels and \u003cstrong\u003e28,800 vibrations per hour\u003c\/strong\u003e – the Hi-Beat frequency explicitly stated on the dial. The higher frequency makes the movement less sensitive to positional changes and shocks and allows for finer adjustment; it is the reason why Hi-Beat movements are still considered the more sophisticated construction principle today.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThis is complemented by automatic winding, a date display, and an overall height of just 10 millimeters, which is typical for the 56 family – remarkable for an automatic movement of this caliber.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe case back is stamped \u003cstrong\u003eSEIKO · KS · WATER RESISTANT · STAINLESS STEEL · 5625-7121\u003c\/strong\u003e with the serial number 334691, dating the watch to \u003cstrong\u003eMarch 1973\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eServiced\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe watch was fully and professionally serviced in Japan in the summer of 2026. With a Hi-Beat movement, this is not a luxury, but a necessity: the higher frequency places greater demands on oils and bearing tolerances, and an unserviced 28,800-vph movement wears out faster than one with a slower beat rate.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eDesign and Character\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe silver dial is finely satin-finished and features applied, multi-faceted indices whose edges refract light sharply – a hallmark of Seiko’s top lines and the reason these dials literally sparkle in cross-light. The \"SEIKO \/ AUTOMATIC\" signature is at 12 o'clock, the KS logo with \"HI-BEAT\" at 6 o'clock. The framed date window is at 3 o'clock.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe stainless steel case measures 36.7 mm excluding the crown, with a 41.1 mm lug-to-lug and a height of only 10 mm. The angular, sharply defined case flanks are the true mark of quality: they are created by the elaborate Zaratsu polishing that Seiko uses in its top lines, which even sixty years later reveals whether a case has ever been over-polished. Weighing 49 grams on the black leather strap, the watch wears light and formal.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eCondition\u003c\/h2\u003e\n\u003cp\u003eThe dial and case are in good condition with only minor signs of wear; the crystal is clear without any major scratches. The original crown with the KS logo is installed, and the edges of the watch remain sharp.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBrand: King Seiko\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eReference: 5625-7121\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCaliber: Seiko 5625\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eMovement: Automatic\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eJewels: 25 Jewels\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eVibrations: 28,800 A\/h (Hi-Beat)\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFunctions: Hours, minutes, sweep seconds, date\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eManufacturer: Daini Seikosha\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCase material: Stainless steel\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDiameter excluding crown: 36.7 mm\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLug-to-lug: 41.1 mm\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHeight: 10 mm\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eLug width: 18 mm\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWeight including strap: 49 g\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSerial number: 334691\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDating: March 1973\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eService: Fully serviced in Japan in summer 2026\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eStrap: Black leather strap\u003c\/li\u003e\n\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eOrigin: Japan\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eFor whom?\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eFor collectors looking for the Seiko top tier of the early 1970s who consciously prefer King Seiko over Grand Seiko. For anyone wanting a Hi-Beat movement on their wrist – the design that is still considered the more sophisticated one today. And for buyers who value documented service more than any promise.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eWarranty (used)\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThis is a used item. The limitation period for claims for defects (statutory warranty) is 12 months from delivery.\u003c\/p\u003e\n\u003ch2 dir=\"ltr\" class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\"\u003eNote\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eAs this is a pre-owned watch, water resistance cannot 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":54163816382802,"sku":"A402","price":949.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/1C2E94F0-C9DD-4301-8B8C-115D0A517BF5.jpg?v=1785769287","url":"https:\/\/japanese-microbrands.com\/en\/products\/king-seiko-5625-7121-hi-beat-marz-1973-cal-5625-25-jewels-28-800-a-h-2026-revidiert","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}