{"product_id":"serviced-vintage-1965-japan-seiko-seikomatic-weekdater-6206-8040-26j-automatic-1","title":"Serviced Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26J Automatic.","description":"\u003cdiv style=\"display: none;\"\u003e\n\u003ch1\u003eServiced Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26J Automatic.\u003c\/h1\u003e\nServiced Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26Jewels Automatic.Welcome to my auction!I am Japanese who live in Tokyo. Item description It's a SEIKO Automatic Watch, SEIKOMATIC WEEKDATER 6206-8040 26Jewels . It's in good used condition. It's difficult to find this valuable watch in such a good condition. Highly recommended for SEIKO collectors! Movement : Pet name : SEIKOMATIC WEEKDATER .Caliber number : 6206A,B.Movement : Automatic.Beat rate : 18000bph.Year of manufacture start : 1963's.Factory : Suwa.Externals : Serial number : 5920969.Dial number : JAPAN 6206-8070R AD.Glass : Acrylic.Case size : About 36.3mm.Lug width : 19mm.Band : Wrist size that can be worn is Up to about 183mm.Condition : Used, it runs well.Quick set(Day\/Date) : Okay.Set the day of the week : English only.Set of the date : The set at one stage pulling the crown.Set of the days of the week : Iteration the hour hand at 9:00 and 12:00The day difference time of an used watch is about +-1 minute \/ day.Overhaul service in July 2026.The movement has been cleaned and oiled, so it works fine.Key Features The Pinnacle of Mid-60s Business Class Prestige (1965): In **1965**—a golden era of rapid urban modernization and surging economic confidence following the Tokyo Olympics—the **Seiko Seikomatic Weekdater** served as the ultimate executive dress watch. Sourced from the legendary **Suwa Seikosha** factory under reference **6206-8040**, this historic model was engineered specifically for the nation's rising class of young, ambitious business managers. Representing a high-end daily instrument of immense reliability, it captured the forward-thinking corporate pride of the mid-Showa miracle. The Premium 26-Jewel Caliber 6206 Automatic Engine: This masterpiece is powered by the highly respected **26-jewel Caliber 6206**, a robust, high-performance automatic movement operating at a classic frequency of **18,000 vibrations per hour (vph)**. Positioned as a direct relative to the movement that would later power the first automatic Grand Seiko (62GS), this **26-jewel specification** used a generous number of synthetic rubies to reduce pivot friction and maximize auto-winding efficiency, securing exceptional long-term stability. Architectural \"\"8040\"\" Beefy Lug Case and Recessed Crown: The reference **6206-8040** is globally celebrated among vintage purists for its substantial, muscular case architecture featuring **thick, prominent multifaceted lugs** that command a powerful wrist presence. Adhering to early automatic pride and functional aesthetic rules, it houses a **completely recessed time-setting crown at 4 o'clock**, signaling that manual winding was fully obsolete due to the high efficiency of the automatic rotor system. Immaculate \"\"Weekdater\"\" Dial Layout and Dual-Calendar Harmony: The dial of the **6206-8040** is a study in clinical mid-century visual balance, showcasing a radiant silver sunburst canvas. It features a highly advanced **separated dual-calendar layout**: a framed date window at 3 o'clock and a wide, completely independent **horizontal day-of-the-week aperture located symmetrically above 6 o'clock**. Decorated with hand-applied, multifaceted chunky block indices, this balanced layout prioritized instant split-second legibility. The Sovereign Legacy of the Engraved Dolphin Case Back: Manufactured in the milestone mechanical year of **1965**, the 6206-8040 26-jewel variant remains a highly coveted cornerstone reference for serious vintage Seiko collectors worldwide. The ultimate hallmark of its premium internal pedigree sits on the screw-down case back: a **crisply detailed, etched Dolphin insignia**, which historically certified its rugged daily durability and water resistance. It stands as a profound testament to an era when Suwa perfected the luxury automatic daily instrument to an eternal standard. For more information, please look at the pictures. Notes Before buying.The 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. To prevent shipping accidents.Please 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. About import taxes.Taxes 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. About Payment, Shipping, Return.Payment, Shipping, Return are in accordance with eBay's business policies. \u003c\/div\u003e\n\n\n\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eServiced Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 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 6206-8040 26Jewels \u003c\/b\u003e.\u003cbr\u003e\n\u003cb\u003eIt's in good uséd 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 : 5920969.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 6206-8070R AD.\u003c\/li\u003e\n\u003cli\u003eGlass : Acrylic.\u003c\/li\u003e\n\u003cli\u003eCase size : About 36.3mm.\u003c\/li\u003e\n\u003cli\u003eLug width : 19mm.\u003c\/li\u003e\n\u003cli\u003eBand : Wrist size that can be worn is Up to about 183mm.\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\u003eUséd, 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 days of the week : Iteration the hour hand at 9:00 and 12:00\u003c\/li\u003e\n\u003cli\u003eThe day difference time of an uséd 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 Pinnacle of Mid-60s Business Class Prestige (1965):\u003c\/b\u003e In **1965**—a golden era of rapid urban modernization and surging economic confidence following the Tokyo Olympics—the **Seiko Seikomatic Weekdater** served as the ultimate executive dress watch. Sourced from the legendary **Suwa Seikosha** factory under reference **6206-8040**, this historic model was engineered specifically for the nation's rising class of young, ambitious business managers. Representing a high-end daily instrument of immense reliability, it captured the forward-thinking corporate pride of the mid-Showa miracle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Premium 26-Jewel Caliber 6206 Automatic Engine:\u003c\/b\u003e This masterpiece is powered by the highly respected **26-jewel Caliber 6206**, a robust, high-performance automatic movement operating at a classic frequency of **18,000 vibrations per hour (vph)**. Positioned as a direct relative to the movement that would later power the first automatic Grand Seiko (62GS), this **26-jewel specification** uséd a generous number of synthetic rubies to reduce pivot friction and maximize auto-winding efficiency, securing exceptional long-term stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"8040\"\" Beefy Lug Case and Recessed Crown:\u003c\/b\u003e The reference **6206-8040** is globally celebrated among vintage purists for its substantial, muscular case architecture featuring **thick, prominent multifaceted lugs** that command a powerful wrist presence. Adhering to early automatic pride and functional aesthetic rules, it houses a **completely recessed time-setting crown at 4 o'clock**, signaling that manual winding was fully obsolete due to the high efficiency of the automatic rotor system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eImmaculate \"\"Weekdater\"\" Dial Layout and Dual-Calendar Harmony:\u003c\/b\u003e The dial of the **6206-8040** is a study in clinical mid-century visual balance, showcasing a radiant silver sunburst canvas. It features a highly advanced **separated dual-calendar layout**: a framed date window at 3 o'clock and a wide, completely independent **horizontal day-of-the-week aperture located symmetrically above 6 o'clock**. Decorated with hand-applied, multifaceted chunky block indices, this balanced layout prioritized instant split-second legibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Sovereign Legacy of the Engraved Dolphin Case Back:\u003c\/b\u003e Manufactured in the milestone mechanical year of **1965**, the 6206-8040 26-jewel variant remains a highly coveted cornerstone reference for serious vintage Seiko collectors worldwide. The ultimate hallmark of its premium internal pedigree sits on the screw-down case back: a **crisply detailed, etched Dolphin insignia**, which historically certified its rugged daily durability and water resistance. It stands as a profound testament to an era when Suwa perfected the luxury automatic daily instrument to an eternal standard.\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\/c1231485504.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\u003cdiv style=\"text-align:center; background:#fff; padding:5px 0px 5px 0px; clear:both; width:100%;\"\u003e\n\u003cdiv style=\"padding-bottom:5px;\"\u003e\n\u003cspan\u003eeBay integration\u003c\/span\u003e by \u003c\/div\u003e\n\u003cimg width=\"120\" src=\"https:\/\/d31wxntiwn0x96.cloudfront.net\/ayjjhk\/\/images\/codisto-connect.png?width=200\u0026amp;nostretch\u0026amp;v=1\"\u003e\n\u003c\/div\u003e","brand":"NONKUN Japan","offers":[{"title":"Default Title","offer_id":52080600777025,"sku":"c1231485504","price":71600.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_1704ef0d-24ee-4602-b885-c861ffc19b38.jpg?v=1786597790","url":"https:\/\/nonkun.com\/products\/serviced-vintage-1965-japan-seiko-seikomatic-weekdater-6206-8040-26j-automatic-1","provider":"NONKUN Japan","version":"1.0","type":"link"}