{"product_id":"vintage-1973-japan-grand-seiko-calendar-5645-7010-25jewels-automatic","title":"Vintage 1973 JAPAN GRAND SEIKO CALENDAR 5645-7010 25Jewels Automatic.","description":"\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eVintage 1973 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 : 370817.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 5645-7020T.\u003c\/li\u003e\n\u003cli\u003eGlass : Crystal.\u003c\/li\u003e\n\u003cli\u003eCase size : About 36.8mm.\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 Benchmark of 1973 Suwa Grand Seiko Luxury (1973):\u003c\/b\u003e Manufactured in **1973**—a historic milestone year representing the apex of late-Showa mechanical watchmaking refinement—the **Grand Seiko Calendar (56GS)** stood as Suwa Seikosha's ultimate statement in executive automatic performance. Sourced under reference **5645-7010**, this date-only flagship instrument was factory-adjusted to strict internal chronometer standards, serving as an authoritative status symbol for high-society executives during the peak of Japan's post-war economic miracle.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe High-Beat 25-Jewel Caliber 5645 Automatic Heart:\u003c\/b\u003e Powering this historic timepiece is the legendary **25-jewel Caliber 5645A**, 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 remarkably ultra-thin architecture and uncompromised chronometric stability, this movement deploys a lavish **25-jewel specification** to control gear-train friction. It incorporates modern executive conveniences including **hacking seconds**, quick-set date calendar functionality, and smooth manual-winding capability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eArchitectural \"\"7010\"\" Grammar of Design Case Geometry:\u003c\/b\u003e The reference **5645-7010** is globally distinguished among serious collectors for its textbook execution of Taro Tanaka's foundational **\"\"Grammar of Design\"\"** guidelines. The solid stainless steel case features extraordinarily sharp, broad-shouldered facets and muscular, mirror-polished bevels engineered to reflect light without distortion. This low center-of-gravity design allows the mechanical instrument to sit completely flush against the wrist, sliding weightlessly under a tailored shirt cuff.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eImmaculate Date-Only Dial Harmony and Clinical Clarity:\u003c\/b\u003e The dial of the **5645-7010** is a masterclass in mid-century visual restraint and high-contrast clarity. Free from day-window clutter, it features **hand-applied, multifaceted hour indices** paired with razor-sharp dauphine hands that capture light with striking contrast. Symmetrically framed at 3 o'clock, the quick-set date window delivers instant split-second legibility, proudly signed with the applied **\"\"GS\"\" logo** and the Suwa electronic symbol above 6 o'clock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Iconic Solid Gold GS Medallion or Engraved Back Heritage:\u003c\/b\u003e The ultimate hallmark of this 1973 treasure sits proudly on the case back: the legendary **solid gold-embossed Grand Seiko medallion** (or deeply engraved GS logo). This crest historically certified its elite manufacturing status and supreme, factory-regulated timing precision. Built to an uncompromising heirloom standard that effortlessly transcends passing fashion trends, the 5645-7010 stands as an eternal, investment-grade testament to the golden era of Japanese automatic engineering.\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\/g1236924098.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":52080601792833,"sku":"g1236924098","price":225600.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_0afd0b16-387d-44c9-8d14-5fc400c52ae2.jpg?v=1786597838","url":"https:\/\/nonkun.com\/products\/vintage-1973-japan-grand-seiko-calendar-5645-7010-25jewels-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}