{"product_id":"vintage-1970-japan-seiko-presmatic-weekdater-5146-7040-27jewels-automatic","title":"Vintage 1970 JAPAN SEIKO PRESMATIC WEEKDATER 5146-7040 27Jewels Automatic.","description":"\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eVintage 1970 JAPAN SEIKO PRESMATIC WEEKDATER 5146-7040 27Jewels 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\u003ePRESMATIC WEEKDATER 5146-7040 27Jewels \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 : 51 SEIKO PRESMATIC WEEKDATER .\u003c\/li\u003e\n\u003cli\u003eCaliber number : 5146A.\u003c\/li\u003e\n\u003cli\u003eMovement : Automatic.\u003c\/li\u003e\n\u003cli\u003eBeat rate : 28800bph.\u003c\/li\u003e\n\u003cli\u003eYear of manufacture start : 1969'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 : 055119.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 5146-7070R.\u003c\/li\u003e\n\u003cli\u003eGlass : Crystal.\u003c\/li\u003e\n\u003cli\u003eCase size : About 36.37mm.\u003c\/li\u003e\n\u003cli\u003eLug width : 18mm.\u003c\/li\u003e\n\u003cli\u003eBand : New Leather Strap of SEIKO original.\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 days of the week : Iteration the hour hand at 8:00 to 12:00.\u003cbr\u003eSet of the date: Press the crown.\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 1970 Kameido Executive Luxury (1970):\u003c\/b\u003e Manufactured in **1970**—a milestone historical year defined by the Osaka Expo '70 and Japan's peak post-war industrial supremacy—the **Seiko 51 Presmatic Weekdater** represented Daini Seikosha's flagship high-tech alternative to traditional luxury dress watches. Sourced under reference **5146-7040**, this high-grade executive model sat directly below the King Seiko line, combining cutting-edge mechanical quick-set technology with bold, geometric Showa-era styling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe High-Beat 27-Jewel Caliber 5146 Automatic Heart:\u003c\/b\u003e Powering this historic instrument is the magnificent **27-jewel Caliber 5146A**, an in-house automatic engine operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Highly celebrated by vintage purists for its lavish **27-jewel specification**, this caliber minimized gear-train friction and incorporated advanced functionality including **hacking seconds**, hand-winding capability, and high chronometric stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRevolutionary \"\"Presmatic\"\" Hexagonal Crown Push-Date Mechanism:\u003c\/b\u003e A defining technological triumph of the 51-series movement was its iconic **crown-center push button (Presmatic mechanism)**. By depressing the center button integrated inside the unique **hexagonal crown**, the wearer could instantly advance the date wheel with a crisp tactile feedback. This clever engineering eliminated the need for secondary case pushers while preserving sleek, water-resistant case lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"7040\"\" Cushion Case and Faceted Dial Geometry:\u003c\/b\u003e The reference **5146-7040** is globally distinguished among vintage collectors for its robust, **cushion-shaped case architecture** featuring sharp, angular facets and sweeping broad shoulders inspired by Taro Tanaka's **\"\"Grammar of Design\"\"** principles. The radiant silver sunburst dial features **hand-applied, multifaceted rectangular hour indices** paired with razor-sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar window houses a **bilingual day disk** alongside the quick-set date configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAn Investment-Grade Masterpiece of Daini's Mechanical Legacy:\u003c\/b\u003e Manufactured in the milestone mechanical year of **1970**, the 5146-7040 27-jewel Presmatic remains one of the most historically significant, highly sought-after Daini references worldwide. It captures the exact historical moment where Kameido perfected high-beat automatic utility right before the industry shifted into quartz technology. Built to an uncompromising heirloom standard, it stands as an eternal testament to late-1960s and early-1970s Japanese horological design.\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\/d1233773550.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":52078120206657,"sku":"d1233773550","price":84400.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_1d689da5-bc2b-4a90-b2f1-28c886302d4a.jpg?v=1786515567","url":"https:\/\/nonkun.com\/products\/vintage-1970-japan-seiko-presmatic-weekdater-5146-7040-27jewels-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}