{"product_id":"serviced-vintage-1966-japan-seiko-seikomatic-weekdater-6206-8100-26j-automatic","title":"Serviced Vintage 1966 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8100 26J Automatic.","description":"\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eServiced Vintage 1966 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8100 26Jewels Automatic.\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 Automatic Watch, \u003cb\u003eSEIKOMATIC WEEKDATER 6206-8100 26Jewels \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 : SEIKOMATIC WEEKDATER .\u003c\/li\u003e\n\u003cli\u003eCaliber number : 6206A,B.\u003c\/li\u003e\n\u003cli\u003eMovement : Automatic.\u003c\/li\u003e\n\u003cli\u003eBeat rate : 18000bph.\u003c\/li\u003e\n\u003cli\u003eYear of manufacture start : 1963'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 : 6552394.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 6206-8090T AD.\u003c\/li\u003e\n\u003cli\u003eGlass : Acrylic.\u003c\/li\u003e\n\u003cli\u003eCase size : About 37mm.\u003c\/li\u003e\n\u003cli\u003eLug width : 19mm.\u003c\/li\u003e\n\u003cli\u003eBand : Wrist size that can be worn is Up to about 200mm.\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\u003eQuick set(Day\/Date) : Okay.\u003cbr\u003eSet the day of the week : English only.\u003cbr\u003eSet of the date : The set at one stage pulling the crown.\u003cbr\u003eSet of the week : Iteration the hour hand at 9:00 and 12:00.\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 May  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 Mid-60s Standard of Executive Refinement (1966):\u003c\/b\u003e In **1966**, the **Seiko Seikomatic Weekdater** stood as the quintessential status symbol for Japan's rapidly ascending corporate leaders and white-collar elite. The reference **6206-8100** was produced by the **Suwa Seikosha** factory during a landmark era of unprecedented national economic growth. It was specifically designed to provide the \"\"New Executive\"\" with a flawless blend of automatic luxury and professional utility, representing the pinnacle of domestic mechanical pride and mid-century design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Sophisticated 26-Jewel Caliber 6206 Heart:\u003c\/b\u003e This watch is powered by the **26-jewel Caliber 6206**, a high-grade automatic movement operating at **18,000 vibrations per hour (vph)**. In **1966**, a **26-jewel specification** was a clear mark of premium engineering, utilizing extra synthetic rubies to ensure an ultra-low friction environment for the complex gear and calendar trains. This caliber features the legendary **Magic Lever** winding system for supreme automatic efficiency, celebrated for its robust architecture that has endured for over half a century.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"8100\"\" Refined-Lug Case Design:\u003c\/b\u003e The reference **6206-8100** is renowned for its elegant, streamlined case geometry. Distinct from other variations, the 8100 profile features beautifully proportioned, clean lugs and a polished bezel that adheres seamlessly to the early principles of the **\"\"Seiko Style.\"\"** A signature trait is the **recessed crown at the 4 o'clock position**, which visually manifested that the watch was so efficiently self-winding that manual intervention was obsolete, maintaining a sleek silhouette under a bespoke dress cuff.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMasterful \"\"Weekdater\"\" Dial Symmetry:\u003c\/b\u003e The dial of the **6206-8100** is a study in clinical elegance, featuring a radiant sunburst silver finish and **hand-applied, multifaceted baton indices**. A signature of this elite lineage is the beautifully balanced dual-calendar layout: the date sits at 3 o'clock, while the **\"\"full window\"\" day-of-the-week disk is positioned independently at 6 o'clock**. Framed in polished steel, this balanced arrangement prioritized instant professional legibility and remains one of Seiko's most recognizable dial designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eA Landmark of Suwa's Automatic Heritage:\u003c\/b\u003e Produced in **1966**, the 6206-8100 remains a highly coveted reference for vintage collectors of the 62-series. It represents the crucial historical bridge between early luxury Seikomatics and the legendary 62GS (the first-ever automatic Grand Seiko). It stands as a profound testament to an era when Suwa Seikosha perfected the **\"\"Professional Business Watch,\"\"** creating a nearly indestructible and visually striking masterpiece that remains as dignified and reliable today as it was sixty years ago.\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\/f1226918972.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\u003cbr\u003e","brand":"Seiko","offers":[{"title":"Default Title","offer_id":52078110572865,"sku":"f1226918972","price":62300.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_1f77ab0d-1520-4958-ba20-979444936d4e.jpg?v=1786515317","url":"https:\/\/nonkun.com\/products\/serviced-vintage-1966-japan-seiko-seikomatic-weekdater-6206-8100-26j-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}