{"product_id":"serviced-vintage-1971-japan-seiko-skyliner-6100-8000-21jewels-hand-winding","title":"Serviced Vintage 1971 JAPAN SEIKO SKYLINER 6100-8000 21Jewels Hand-winding.","description":"\"\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eVintage 1971 JAPAN SEIKO SKYLINER 6100-8000 21Jewels Hand-winding.\u003c\/h3\u003e\u003cp\u003eWelcome to my auction!\u003cbr\u003eI am Japanese who live in Tokyo.\u003c\/p\u003e\n\u003ch4 style=\"font-size: 24px; color : #2B0000; margin-bottom: 18px;\"\u003eItem description\u003c\/h4\u003e\u003cdiv style=\"font-size: 24px; color:red; margin: 0 50px 18px 35px;\"\u003e\nIt's a SEIKO Hand-winding Watch, \u003cb\u003eSKYLINER 6100-8000 21Jewels \u003c\/b\u003e.\u003cbr\u003e\n\u003cb\u003eIt's in good used condition.\u003c\/b\u003e\u003cbr\u003e\nIt's difficult to find this valuable watch in such a good condition.\nHighly recommended for SEIKO collectors!\n\u003c\/div\u003e\n\u003cdl style=\"margin:0 0 34px 90px\"\u003e\n\u003cdt\u003e\u003cfont color=\"#970000\"\u003e\u003cb\u003eMovement : \u003c\/b\u003e\u003c\/font\u003e\u003c\/dt\u003e\n\u003cdd\u003e\u003cul\u003e\n\u003cli\u003ePet name : 61 SKYLINER .\u003c\/li\u003e\n\u003cli\u003eCaliber number : 61A.\u003c\/li\u003e\n\u003cli\u003eMovement : Hand-winding.\u003c\/li\u003e\n\u003cli\u003eBeat rate : 21600bph.\u003c\/li\u003e\n\u003cli\u003eYear of manufacture start : 1968's.\u003c\/li\u003e\n\u003cli\u003eFactory : Suwa.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/dd\u003e\n\u003cdt\u003e\u003cfont color=\"#970000\"\u003e\u003cb\u003eExternals : \u003c\/b\u003e\u003c\/font\u003e\u003c\/dt\u003e\n\u003cdd\u003e\u003cul\u003e\n\u003cli\u003eSerial number : 109058.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 61-8000T.\u003c\/li\u003e\n\u003cli\u003eGlass : Acrylic.\u003c\/li\u003e\n\u003cli\u003eCase size : About 37mm.\u003c\/li\u003e\n\u003cli\u003eLug width : 18mm.\u003c\/li\u003e\n\u003cli\u003eBand : Wrist size that can be worn is Up to about 203mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/dd\u003e\n\u003cdt\u003e\u003cfont color=\"#970000\"\u003e\u003cb\u003eCondition : \u003c\/b\u003e\u003c\/font\u003e\u003c\/dt\u003e\n\u003cdd\u003e\u003cul\u003e\n\u003cli\u003eUsed, it runs well.\u003c\/li\u003e\n\u003cli\u003eThe day difference time of an used watch is about +-1 minute \/ day.\u003c\/li\u003e\n\u003cli\u003e\u003cb style=\"color : red\"\u003eOverhaul service in July  2026.\u003cbr\u003eThe movement has been cleaned and oiled, so it works fine.\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/dd\u003e\n\u003cdt\u003e\u003cfont color=\"#970000\"\u003e\u003cb\u003eKey Features\u003c\/b\u003e\u003c\/font\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cli\u003e\n\u003cb\u003eThe Zenith of Manual Minimalism (1971):\u003c\/b\u003e In **1971**, the **Seiko Skyliner** stood as a brilliant counter-statement to the heavy, multi-functional automatic trends of the era. The reference **6100-8000** was produced by the **Suwa Seikosha** factory during a landmark historical turning point when the watchmaking world was shifting toward electronic quartz. By deliberately prioritizing a pure manual-wind, time-only configuration, Seiko offered the discerning Showa-era professional a level of quiet sophistication and ultra-slim elegance that captured the disciplined, minimalist heart of Japanese industrial design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Robust 21-Jewel Caliber 6100 Heart:\u003c\/b\u003e This watch is powered by the **21-jewel Caliber 6100**, a high-precision, low-profile manual-wind movement operating at **21,600 vibrations per hour (6 beats per second)**. In **1971**, the 61-series hand-wound architecture was celebrated for its extreme structural reliability and ease of maintenance. By completely omitting the calendar mechanism, this caliber achieved a highly streamlined, friction-free gear train supported by **21 synthetic rubies**, delivering a tactile, highly satisfying winding ritual and relentless daily accuracy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"8000\"\" Grammar of Design Case:\u003c\/b\u003e The reference **6100-8000** is a definitive and masterful execution of the legendary **Seiko \"\"Grammar of Design\"\"** philosophy. The stainless steel case features ultra-sharp geometric facets and perfectly straight, tapered lugs finished with specialized mirror polishing to create a beautiful play of light and shadow. In **1971**, the absence of an automatic rotor and calendar assembly allowed Suwa Seikosha to craft an **ultra-thin silhouette** that sat incredibly flush and comfortably on the wrist under a tailored shirt cuff.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Ultimate \"\"No-Date\"\" Symmetrical Dial Purity:\u003c\/b\u003e The dial of the **6100-8000** is a masterclass in clinical luxury, featuring a radiant sunburst silver finish and **hand-applied, multifaceted baton indices**. By entirely omitting the date window, this elite dress reference achieves **perfect visual symmetry**, highlighting the uncompromising legibility of the razor-sharp Dauphine hands. The crisp, flowing **\"\"Skyliner\"\" script logo** above 6 o'clock remains a highly coveted hallmark, symbolizing an era that valued bold industrial pride and timeless aesthetic restraint.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eA Landmark of Suwa's Pure Mechanical Heritage:\u003c\/b\u003e Produced in **1971**, the 6100-8000 remains one of the most highly sought-after \"\"purist\"\" references for vintage collectors who value the **\"\"No-Date Mechanical\"\" legacy**. It represents the perfect historical intersection where robust, proven engineering met the absolute peak of mid-century minimalist architectural design. It stands as a profound testament to an era when Suwa Seikosha perfected the **\"\"Ultra-Slim Executive Dress Watch,\"\"** creating an indestructible and visually striking masterpiece that transcends passing horological trends.\u003c\/li\u003e\n\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cdl style=\"margin:0 0 34px 40px\"\u003e\n\u003cdt style=\"font-size: 24px;font-weight: bolder;\"\u003eFor more information, please look at the pictures.\u003c\/dt\u003e\n\u003cdd\u003e\u003cdiv style=\"margin: 14px 0 40px 0;\"\u003e\u003cimg src=\"https:\/\/nonkun.boy.jp\/img_ebay\/k1230234204.jpg\"\u003e\u003c\/div\u003e\u003c\/dd\u003e\n\u003cdt style=\"font-size: 24px;font-weight: bolder;\"\u003eNotes\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cul style=\"margin-bottom: 18px;\"\u003e\n\u003cli\u003e\n\u003cb\u003eBefore buying.\u003c\/b\u003e\u003cdiv style=\"padding-left : 30px;\"\u003eThe vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.\u003c\/div\u003e\n\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTo prevent shipping accidents.\u003c\/b\u003e\u003cdiv style=\"padding-left : 30px;\"\u003ePlease monitor the tracking number until the item arrives and if it stagnates, please investigate at your country post office. Also, please confirm the item when you receive the item.\u003c\/div\u003e\n\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAbout import taxes.\u003c\/b\u003e\u003cdiv style=\"padding-left : 30px;\"\u003eTaxes such as import duties and VAT are not included in the item price or shipping charges, except for items shipped to the US. When you purchase, you will likely be required to pay these fees in your country.\u003c\/div\u003e\n\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAbout Payment, Shipping, Return.\u003c\/b\u003e\u003cdiv style=\"padding-left : 30px;\"\u003ePayment, Shipping, Return are in accordance with eBay's business policies.\u003c\/div\u003e\n\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/dd\u003e\n\u003c\/dl\u003e\"","brand":"NONKUN Japan","offers":[{"title":"Default Title","offer_id":52141477888321,"sku":"k1230234204","price":52700.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_5d849f17-fc64-4e27-a155-10826b1b0037.jpg?v=1787798656","url":"https:\/\/nonkun.com\/products\/serviced-vintage-1971-japan-seiko-skyliner-6100-8000-21jewels-hand-winding","provider":"NONKUN Japan","version":"1.0","type":"link"}