{"product_id":"vintage-1965-japan-seiko-seikomatic-weekdater-6206-8990-26jewels-automatic","title":"Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8990 26Jewels Automatic.","description":"\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eVintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8990 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 6206-8990 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 : 5702553.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 6206-8990R.\u003c\/li\u003e\n\u003cli\u003eGlass : Acrylic.\u003c\/li\u003e\n\u003cli\u003eCase size : About 37.1mm.\u003c\/li\u003e\n\u003cli\u003eLug width : 19mm.\u003c\/li\u003e\n\u003cli\u003eBand : New Leather Strap.\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 : Kanji only.\u003cbr\u003eSet of the date : The set at one stage pulling the crown.\u003cbr\u003eSet of the days of the week : Iteration the hour hand at 10:00 and 1:00\u003c\/li\u003e\n\u003cli\u003eThe day difference time of an used watch is about +-1 minute \/ day.\u003c\/li\u003e\n\u003cli\u003eFor practical, everyday use, it would be advisable to have the movement cleaned and oiled.\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 Sovereign Peak of Mid-60s Full-Calendar Executive Luxury (1965):\u003c\/b\u003e Manufactured in **1965**—a pivotal historical year during Japan's post-war economic modernization—the **Seiko Seikomatic Weekdater** represented Suwa Seikosha's benchmark executive line. Sourced under reference **6206-8990**, this mid-1960s flagship was engineered to deliver top-tier automatic reliability paired with high-grade internal mechanical finishing and distinct full-calendar legibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Over-Engineered 26-Jewel Caliber 6206 Automatic Heart:\u003c\/b\u003e Powering this historic timepiece is the revered **26-jewel Caliber 6206B**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping an executive dress watch in **1965** with a lavish **26-jewel specification** minimized gear-train pivot wear, delivering exceptional long-term accuracy and incorporating Seiko's proven **Diashock** anti-shock architecture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"8990\"\" Case Geometry and Recessed Crown Integration:\u003c\/b\u003e The reference **6206-8990** is globally distinguished among vintage Seiko collectors for its broad, sharp-faceted stainless steel case architecture. Designed with an ultra-thin bezel profile and the iconic **recessed crown at 4 o'clock**, the case achieves a seamless, crownless silhouette that sits remarkably flat and flush against the wrist.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIconic Separate \"\"Weekdater\"\" Layout and Dial Harmony:\u003c\/b\u003e The dial of the **6206-8990** is a masterclass in mid-century visual balance, featuring a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices**. It showcases the celebrated **arched day window above 6 o'clock** displaying the full day of the week, perfectly balanced by the independent date calendar window framed at 3 o'clock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Sovereign Gold Dolphin or Engraved Case Back Heritage:\u003c\/b\u003e The ultimate hallmark of this 1965 treasure sits proudly on the case back: the iconic **embossed gold or deeply engraved Seiko Dolphin crest**. This emblem historically certified its factory-regulated precision standard and water-resistant case construction, securing the 6206-8990 as an eternal, investment-grade cornerstone reference for collectors worldwide.\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\/n1239035914.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":52112832790849,"sku":"n1239035914","price":87300.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_9c7afec9-6697-4423-8a67-f9f2066ffbaf.jpg?v=1787536394","url":"https:\/\/nonkun.com\/en\/products\/vintage-1965-japan-seiko-seikomatic-weekdater-6206-8990-26jewels-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}