{"product_id":"vintage-1971-japan-grand-seiko-calendar-5645-7010-25jewels-automatic","title":"Vintage 1971 JAPAN GRAND SEIKO CALENDAR 5645-7010 25Jewels Automatic.","description":"\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eVintage 1971 JAPAN GRAND SEIKO CALENDAR 5645-7010 25Jewels 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 Automatic Watch, \u003cb\u003eGRAND SEIKO CALENDAR 5645-7010 25Jewels \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 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 : 56 GRAND SEIKO CALENDAR .\u003c\/li\u003e\n\u003cli\u003eCaliber number : 5645A.\u003c\/li\u003e\n\u003cli\u003eMovement : Automatic.\u003c\/li\u003e\n\u003cli\u003eBeat rate : 28800bph.\u003c\/li\u003e\n\u003cli\u003eYear of manufacture start : 1970'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 : 161666.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 5645-7010T.\u003c\/li\u003e\n\u003cli\u003eGlass : Crystal.\u003c\/li\u003e\n\u003cli\u003eCase size : About 36.5mm.\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 of the date : The set at one stage pulling 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 1971 High-Grade Chronometry (1971):\u003c\/b\u003e Manufactured in **1971**—a historic milestone year during the apex of Suwa Seikosha's mechanical achievements—the **Grand Calendar** represented the gold standard of Japanese high-precision watchmaking. Sourced under reference **5645-7010**, this high-grade automatic timepiece was engineered to deliver uncompromising internal chronometric accuracy paired with Taro Tanaka's iconic grammar-driven design language.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Over-Engineered High-Beat 25-Jewel Caliber 5645 Heart:\u003c\/b\u003e Powering this legendary instrument is the in-house **25-jewel Caliber 5645A**, operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Regulated at the factory to strict internal Grand standard specifications, this movement features **hacking seconds**, smooth manual-winding capability, a quick-set date mechanism, and micro-adjuster rate regulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"7010\"\" Grammar of Design Case Geometry:\u003c\/b\u003e The reference **5645-7010** is globally revered among vintage collectors as one of the purest expressions of the **\"\"Grammar of Design\"\"** philosophy. Executed in solid stainless steel, the case features flat, mirror-polished Zaratsu facets, razor-sharp lug lines, and geometric angles engineered to reflect light cleanly without visual distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eImmaculate Date-Only Dial Balance and Clinical Precision:\u003c\/b\u003e The dial of the **5645-7010** exhibits exceptional visual restraint, showcasing a radiant silver canvas decorated with **hand-applied, multifaceted rectangular hour indices** with dark center inserts. Symmetrically framed at 3 o'clock, the date calendar window provides sharp legibility, perfectly offset by the applied **\"\"GS\"\"** emblem and bold **\"\"HI-BEAT\"\"** typography above 6 o'clock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Sovereign Solid Gold GS Case Back Medallion:\u003c\/b\u003e The ultimate seal of authenticity and prestige sits proudly on the case back: the iconic **solid gold GS medallion** set flush into the stainless steel backplate. Certified to elite internal accuracy standards, the 5645-7010 Grand stands as an eternal, investment-grade cornerstone reference for serious vintage horological 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\/b1237688534.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":52118540026177,"sku":"b1237688534","price":208400.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_1078f323-9e94-499a-9ac7-3f84a9bb2bce.jpg?v=1787622217","url":"https:\/\/nonkun.com\/products\/vintage-1971-japan-grand-seiko-calendar-5645-7010-25jewels-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}