{"product_id":"grand-seiko-4520-8000-in-steel-hi-beat-september-1968","title":"Grand Seiko 4520-8000 in steel, hi-beat, September 1968","description":"\u003cp\u003eMaker: Seiko\u003cbr\u003eModel: Grand Seiko 4520-8000 hibeat\u003cbr\u003eYear: 1968 September\u003cbr\u003eCase Serial: 890315\u003cbr\u003eCase Material: stainless steel\u003cbr\u003eCase Dimensions: 36mm, thickness 9mm\u003cbr\u003eCaliber: 4520A 25jewels\u003cbr\u003eService history: October 2025. Currently running at -7.6 seconds\/day.\u003cbr\u003eLug Width: 18mm\u003cbr\u003eBracelet\/Strap: generic calf epsom strap (pictured)\u003cbr\u003eBox\/Papers: none\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Grand Seiko 4520-8000 is a historically important timepiece produced by Daini Seikosha Kameido factory, a subsidiary of Hattori Watch Company (aka. Seiko). One of the standout features of the Grand Seiko 4520-8000 (and its date brother 4522) is its slim \"grammar of design\" case profile. At just 9mm thick, this watch is much thinner than many other mechanical watches of the era. The case famously was designed by Tanaka Taro, Seiko's first in house designer, and was first introduced used in the 44GS - also produced by the Kameido factory. Powering the Grand Seiko 4520-8000 is the high-quality 4520A caliber-developed in-house by Daini Seikosha and arguably the greatest movement made by Seiko. Introduced in 1968, the Hi-Beat caliber 45 was used in both the King Seiko and Grand Seiko models, and is loved by Seiko enthusiasts around the world for its incredible accuracy. The 45 family of caliber's consists of the 4502A, 4500A, 4520A, 4522A, and the 4580. Hi-beat (that is a movement with 36000 bph) movements existed before 1968, most notably constructed by Girard-Perregaux and Suwa Seikosha, but the caliber 45 was designed by Daini Seikosha completely from scratch and in-house. The 45 family of movements represent the pinnacle of Japanese watchmaking achievement as its derivative competed in the 1968 Geneva watch competitions where it swept the mechanical watch category for accuracy beating out Swiss watchmakers. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThis is an outstanding example of an all-original Grand Seiko 4520-8000, preserved in remarkably good condition for its age. Having handled numerous 45GS examples over the years, we believe the case on this particular watch has likely never been polished. The original sharp lines and distinctive Tanaka design grammar remain beautifully intact, giving the case the crisp profile that collectors look for. Finding an unpolished, all-original 45GS in Japan has become increasingly difficult. There are some light scratches and minor bumps to the case and bezel, as would be expected from a watch of this age, but nothing significant. The original silver-white dial has developed a subtle patina over the years and remains exceptionally clean, with no major blemishes. The original handset and crown are also in excellent condition. The case back retains its original gold GS medallion, which remains crisp overall. There is a small dent to the medallion and some scratches on the case back, but neither detracts from the overall condition. The movement was serviced by the previous owner and is currently running well at approximately -7.6 seconds per day.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eShips from Japan\u003c\/p\u003e","brand":"Special Dial","offers":[{"title":"Default Title","offer_id":54553629524243,"sku":null,"price":2400.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/6765\/4419\/files\/DSC07024.jpg?v=1786278609","url":"https:\/\/specialdial.com\/ja\/products\/grand-seiko-4520-8000-in-steel-hi-beat-september-1968","provider":"Special Dial","version":"1.0","type":"link"}