{"product_id":"vintage-1964-japan-seiko-sportsmatic5-dx-427990-23jewels-automatic","title":"Vintage 1964 JAPAN SEIKO SPORTSMATIC5 DX 427990 23Jewels Automatic.","description":"\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eVintage 1964 JAPAN SEIKO SPORTSMATIC5 DX 427990 23Jewels 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\u003eSPORTSMATIC5 DX 427990 23Jewels \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 : SPORTSMATIC5 DX .\u003c\/li\u003e\n\u003cli\u003eCaliber number : 7606A.\u003c\/li\u003e\n\u003cli\u003eMovement : Automatic.\u003c\/li\u003e\n\u003cli\u003eBeat rate : 18000bph.\u003c\/li\u003e\n\u003cli\u003eYear of manufacture start : 1964's.\u003c\/li\u003e\n\u003cli\u003eFactory : Kameido.\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 : 4803925.\u003c\/li\u003e\n\u003cli\u003eDial number : MADE IN JAPAN 42 799RO.\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 : 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 : English only. \u003cbr\u003eSet of the date: Press the button near the 3:00 position. \u003cbr\u003eSet of the days of the week : Turn the hour hand for 24 hours to set it.\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 Dawn of the \"\"Deluxe\"\" Era (1964):\u003c\/b\u003e In **1964**, the year of the Tokyo Olympics, the **Seiko Sportsmatic 5 DX** represented the first premium evolution of the revolutionary \"\"Seiko 5\"\" concept. The reference **427990** was produced by the **Suwa Seikosha** factory during a landmark year for Japan. It arrived as a high-spec \"\"Deluxe\"\" version, elevating the brand from a reliable utility watch to a sophisticated status symbol for the modern, Olympic-era professional.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe High-Grade 23-Jewel Automatic Heart:\u003c\/b\u003e This watch is powered by a **23-jewel automatic movement** operating at **18,000 vibrations per hour (vph)**. In **1964**, the **23-jewel specification** was an elite count for the Sportsmatic line, utilizing additional synthetic rubies to minimize friction in the calendar and winding systems. It featured the legendary **\"\"Magic Lever\"\"** winding mechanism, which ensured maximum efficiency, signaling to the wearer that manual winding was a thing of the past.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"427990\"\" Case and Recessed Crown:\u003c\/b\u003e The reference **427990** features a robust, circular case with sharp, mirror-polished lugs. A defining trait of the Suwa factory is the **crown recessed at the 4 o'clock position**, making it nearly invisible from the front. In **1964**, this was a bold visual statement to the world that the watch was a \"\"pure automatic,\"\" allowing the elegant, uninterrupted symmetry of the case to take center stage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMasterful \"\"Weekdater\"\" Dial Symmetry:\u003c\/b\u003e The dial of the **427990** is a study in functional luxury, featuring a radiant sunburst silver finish and **hand-applied, multi-faceted baton indices**. The arched day-of-the-week window at 6 o'clock and the date window at 3 o'clock provided an organized, professional aesthetic. The applied **\"\"5\"\" shield logo** and the Suwa factory symbol remain hallmarks of this era’s high-status branding, prioritizing sophisticated clarity for the global businessman.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eA Landmark of Suwa \"\"Active Dress\"\" Heritage:\u003c\/b\u003e Produced in **1964**, the 427990 remains one of the most culturally significant \"\"early 5s\"\" for collectors. It often features the iconic **Dolphin etching** on the case back, symbolizing its reliable water resistance and \"\"Sports\"\" pedigree. It stands as a testament to an era when Seiko combined **mechanical innovation with a timeless aesthetic**, creating a reliable companion for the men who built modern, post-war Japan.\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\/c1224018161.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\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/dd\u003e\n\u003c\/dl\u003e\u003cbr\u003e","brand":"NONKUN Japan","offers":[{"title":"Default Title","offer_id":52137940713793,"sku":"c1224018161","price":37900.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_156b6578-074a-45fc-af81-5cc02b81cec0.jpg?v=1787708513","url":"https:\/\/nonkun.com\/products\/vintage-1964-japan-seiko-sportsmatic5-dx-427990-23jewels-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}