{"product_id":"grand-seiko-61gs-hi-beat-ref-6146-8050-kaliber-6146a-36-000-a-h-suwa-seikosha-blau-graues-zifferblatt-facettiertes-glas-mai-1972-frisch-revidiert","title":"Grand Seiko 61GS Hi-Beat – Ref. 6146-8050 – Caliber 6146A, 36,000 vph, Suwa Seikosha – blue-grey dial, faceted crystal – May 1972 – freshly serviced","description":"\u003cp dir=\"ltr\"\u003e \u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eTen beats per second.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThat is what sets a 1972 Hi-Beat apart from almost everything else built at that time – and what only a few manufacturers even offer today. If you observe the second hand of this watch, you no longer see steps. You see a movement.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eA reference that only existed for two months\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThe 6146-8050 is among the rarest Grand Seiko models of the classic era. Based on the consensus of the collector community, it was produced for only \u003cstrong\u003eabout two months in 1972\u003c\/strong\u003e: all known examples bear production dates from April or May 1972.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe serial number of this watch is 255389. Following the Seiko scheme – the first digit is the last digit of the year, the second digit is the month – this translates to \u003cstrong\u003eMay 1972\u003c\/strong\u003e. It thus originates from the final documented month of production for this reference.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eWhy Seiko built the 8050 for such a short time is unknown. What remains is a watch that is rarely seen on the market – and which occupies a special position in its design.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eThe case and the faceted crystal\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eMost 61-series Grand Seiko watches have a round case with a domed crystal. The 8050 does not. It features an angular, wide-drawn case in the style of the early 1970s – topped with a \u003cstrong\u003efaceted crystal\u003c\/strong\u003e, whose ground edge surfaces refract light at the edge of the dial.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThis effect is the watch’s true appeal. Depending on the angle, narrow bands of light appear at the edge of the crystal, running around the dial. This is almost impossible to photograph; you have to turn the watch in your hand.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThis also has practical implications: \u003cstrong\u003ethese crystals are no longer available today.\u003c\/strong\u003e A damaged faceted crystal can only be replaced with a standard round one, causing the watch to lose its character. The crystal on this piece is flawless and original – the most important condition factor for this reference.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe case itself is hand-polished using the \u003cstrong\u003eZaratsu method\u003c\/strong\u003e: a process in which the workpieces are guided against a rotating disc to create completely distortion-free, mirror-like surfaces. Grand Seiko still uses this method today, and it is the reason why the surfaces on these cases look different than on machine-polished watches – free of waviness, with razor-sharp edges against the brushed sections.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThis is based on the design language formulated by Taro Tanaka at Seiko, which became canonical with the 1967 44GS: flat surfaces instead of rounded transitions, with every surface reflecting light in a defined direction, and no edge ever softened by polishing.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eThe 6146A caliber\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThe 61GS series appeared in February 1968 – introduced not in the catalog, but in Seiko's dealer magazine. It brought the \u003cstrong\u003efirst Japanese automatic movement with 36,000 semi-oscillations per hour\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul dir=\"ltr\"\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAutomatic\u003c\/strong\u003e with additional manual winding\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSeconds stop\u003c\/strong\u003e (hacking) when the crown is pulled\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003e25 jewels\u003c\/strong\u003e, 36,000 bph – ten beats per second, 5 Hz\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDay and date\u003c\/strong\u003e with quick-set\u003c\/li\u003e\n\n\u003cli\u003eManufactured by \u003cstrong\u003eSuwa Seikosha\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp dir=\"ltr\"\u003eThe purpose of the high frequency: the faster the balance wheel oscillates, the less it is affected by external influences – shocks, changes in position, or acceleration while being worn. The balance returns to its rhythm more quickly, and the rate becomes more stable. The price is higher wear and more complex construction, which is why such movements were used exclusively in top-tier lines.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eThe Grand Seiko Standard\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eSeiko subjected the 6145A and 6146A calibers to the in-house \u003cstrong\u003eGrand Seiko Standard\u003c\/strong\u003e: regulated to \u003cstrong\u003e–3 to +5 seconds per day\u003c\/strong\u003e, tested in several positions and at different temperatures.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThis standard was stricter than the Swiss chronometer certification in effect at the time. Seiko created it after Japanese watches competed against European rivals at the Neuchâtel Observatory accuracy competitions – where they advanced from the bottom of the rankings to the top within a few years.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eWithin the 61 series, there were two levels above this: the 6155A\/6156A calibers designated as \"Special\" with ±3 seconds, and the V.F.A. 6185\/6186 movements with ±2 seconds, which were assembled by selected watchmakers using hand-picked components. This watch belongs to the base level – which itself was superior to what was considered a chronometer in Europe.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eSuwa and Daini\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eSeiko maintained two competing production facilities: \u003cstrong\u003eSuwa Seikosha\u003c\/strong\u003e in Nagano and \u003cstrong\u003eDaini Seikosha\u003c\/strong\u003e in Tokyo. Both developed their own movements and competed against each other; management expressly encouraged this.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eGrand Seiko was built by both – the 44GS, 45GS, and 45GS V.F.A. came from Daini, while practically everything else came from Suwa. This 61GS comes from \u003cstrong\u003eSuwa\u003c\/strong\u003e, recognizable by the small swirl logo on the dial and case back. Daini responded to the 61GS with the manual-wind 45GS, which also ran at 36,000 semi-oscillations.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eSuwa Seikosha later became Seiko Epson, and Daini Seikosha became Seiko Instruments.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eDial\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThe dial is rendered in a deep \u003cstrong\u003eblue-gray\u003c\/strong\u003e – significantly rarer than the silver versions that make up the majority of 61GS production. A fine sunburst finish radiates from the center; depending on the light, the tone shifts between a light, bluish tin-gray and an almost anthracite-like dark.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe hour markers are applied, multi-faceted indices with razor-sharp edges and wide polished surfaces – a counterpiece to the case. These are paired with angular, similarly faceted hands and a slender central seconds hand.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe dial is sparsely labeled: \u003cem\u003eSEIKO AUTOMATIC\u003c\/em\u003e at the top, \u003cem\u003eGS HI-BEAT\u003c\/em\u003e with the Suwa logo at the bottom. The calendar window at three o'clock is framed with an applied border; Sunday is shown in red.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eCondition\u003c\/h3\u003e\n\u003cp dir=\"ltr\"\u003eThis watch is in truly excellent condition.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eThe faceted crystal is flawless and original\u003c\/strong\u003e – without scratches, chips, or cloudiness on the ground surfaces. For this reference, this is the deciding factor, as replacements are unavailable.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eTechnically flawless: the watch was professionally serviced in Japan in the spring\/summer of 2026 – completely disassembled, cleaned, oiled, and regulated. The automatic system, manual wind, seconds stop, and quick-set for day and date all work perfectly.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe dial is clean and uniform, with no spots, discoloration, or fading. The lettering is complete and sharp, the applied indices are securely seated, show no corrosion, and have retained their edge definition. The calendar frame is intact.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe stainless steel case shows only very light, age-appropriate signs of wear. The Zaratsu-polished surfaces are preserved, the edges against the brushed sections are clearly defined – the watch has not been re-polished, which is the most important case criterion for Grand Seiko.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eThe GS-signed crown\u003c\/strong\u003e is original and clearly stamped; signed crowns were often replaced with simple spare parts during repairs over the decades. \u003cstrong\u003eThe gold medallion on the case back\u003c\/strong\u003e is completely preserved, and the embossing and Suwa logo are sharp. All case back engravings – reference 6146-8050, serial number 255389 – are clearly legible.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eThe watch is fitted with a new, high-quality Seiko leather strap.\u003c\/p\u003e\n\u003ch3 dir=\"ltr\"\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul dir=\"ltr\"\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eBrand \/ Line:\u003c\/strong\u003e Grand Seiko, 61GS Hi-Beat\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eReference:\u003c\/strong\u003e 6146-8050\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSerial number:\u003c\/strong\u003e 255389\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eProduction date:\u003c\/strong\u003e May 1972\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eMovement:\u003c\/strong\u003e Seiko Caliber 6146A, automatic with manual wind, 25 jewels, 36,000 bph, seconds stop\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Suwa Seikosha, Japan\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eRegulation:\u003c\/strong\u003e Grand Seiko Standard, –3 to +5 seconds per day\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Hours, minutes, central seconds, day and date with quick-set\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCase:\u003c\/strong\u003e Stainless steel, Zaratsu polishing, GS-signed crown, gold medallion on the case back\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eDiameter (without crown):\u003c\/strong\u003e 37.9 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 12.8 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eLug-to-lug:\u003c\/strong\u003e 41.9 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eLug width:\u003c\/strong\u003e 18 mm\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eWeight (incl. strap):\u003c\/strong\u003e 61 g\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eStrap:\u003c\/strong\u003e New Seiko leather strap\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e Original faceted crystal\u003c\/li\u003e\n\n\u003cli\u003e\n\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 collectors searching for a vintage Grand Seiko who do not want the reference everyone else has. The 6146-8050 was built over a two-month period; it appears on the market only occasionally, and even more rarely with an intact, original faceted crystal.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eFor those who want a Hi-Beat movement on their wrist. 36,000 semi-oscillations were the pinnacle of what was technically possible in 1972, and in a way, they remain so – only a few manufacturers build movements at this frequency today.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eAnd for anyone who has seen what a faceted crystal does with light. You turn the watch, and a narrow bright band follows along the edge of the dial. You will find that on almost no other watch.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003eWith a diameter of 37.9 mm and a lug-to-lug of only 41.9 mm, it wears with presence but compactly – the short, angular lugs make it wearable even on medium-sized wrists.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWarranty (used)\u003c\/strong\u003e\u003cbr\u003eThis is a used 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, 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":54777269780818,"sku":"A482","price":2699.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0911\/3908\/0530\/files\/9B921CDE-5C6F-4F6F-BE44-5824EC7C2882.jpg?v=1789851461","url":"https:\/\/japanese-microbrands.com\/en\/products\/grand-seiko-61gs-hi-beat-ref-6146-8050-kaliber-6146a-36-000-a-h-suwa-seikosha-blau-graues-zifferblatt-facettiertes-glas-mai-1972-frisch-revidiert","provider":"Japanese Microbrands - Mario Lenke","version":"1.0","type":"link"}