{"product_id":"vintage-watch-king-seiko-4502-8020-chronometer-batwing-case","title":"Vintage Watch | King Seiko 4502-8020 Chronometer Batwing Case","description":"\u003ch2 dir=\"auto\"\u003e\u003cspan style=\"color: rgb(255, 128, 0);\"\u003e\u003cstrong\u003eKing Seiko 4502-8020 Chronometer: March 1970, 8010 Bat-Wing Case, Near Mint\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eA King Seiko 4502-8020 Chronometer is a Daini 45KS in the 8010 bat-wing case: manual-wind, 36,000 beats per hour, date, officially certified chronometer. This one is March 1970. The case is brushed on top and mirror-finished on the sides. The gold medallion is intact. Overall condition is close to mint.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cstrong\u003eWhat the Seiko Chronometer mark means\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eKing Seiko chronometers of this generation were certified by the Japan Chronometer Inspection Institute (JCII), set up in December 1968, to the old Swiss-style standard. COSC did not yet exist; it was founded in 1973. Early mid-1969 examples that met the tighter AA grade (−3 to +6 seconds a day, the same band as Grand Seiko) were marked Superior Chronometer. From about 1970 the dial and medallion drop “Superior” and read Chronometer Officially Certified — the standard A grade. This 4502-8020 is that later Chronometer. Same 45 movement family. Different grade on the dial.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0299\/7639\/5913\/files\/King_Seiko_4502_Chronometer_23_600x600.jpg?v=1791991161\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cstrong\u003eThe Seiko 45 high beat movement\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eCaliber 4502 is a hand-wound, 25-jewel, 36,000 bph date calibre from Daini. It is the last hand-built King Seiko high-beat; later KS used machine finishing. The 45 series is the production form of the work that put Seiko on the podium at Neuchâtel and Geneva. A 4502 is not itself a contest movement. It is the wristwatch that came out of that programme, adjusted and certified.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cstrong\u003eWhy is the Seiko 8010 bat-wing case special and what is the original condition\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eReference Seiko 8010 case: short stubby lugs, flanks that drop sharply, a convex bat-wing or turtle profile rather than the long-lug in other more common 7000 case. About 37 mm across, 42 mm lug-to-lug, 18 mm lugs. On this watch the top is brushed and the sides are mirror. Edges are still there. The gold KS medallion on the caseback is in perfect condition — the part that usually wears off first. Close to mint for a March 1970 steel King Seiko.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eMaker:\u003c\/strong\u003e Seiko\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eModel:\u003c\/strong\u003e King Seiko 4502-8020 Chronometer\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eEra:\u003c\/strong\u003e March 1970\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCase:\u003c\/strong\u003e 8010 case a rare bat-wing shape, stainless, the top of the case is in brushed top, and side of the watch is in mirror sides, close to mint\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCase Diameter:\u003c\/strong\u003e approx. 37 mm\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLug to Lug:\u003c\/strong\u003e approx. 42 mm\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLug Width:\u003c\/strong\u003e 18 mm\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCaseback:\u003c\/strong\u003e Gold medallion, in perfect condition\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eDial:\u003c\/strong\u003e Perfect condition King Seiko Chronometer Officially Certified \u003cbr\u003e\u003cstrong\u003eMovement:\u003c\/strong\u003e Manual-wind Caliber 4502, 25 jewels, 36,000 bph, date, JCII chronometer grade\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eA March 1970 King Seiko 4502-8020 Chronometer in this case, with the medallion still whole, is the later certified 45KS — not the Superior, and priced as what the dial says.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eShown on a strap. Any colour from our Saddle Series or Kyoto Series on request.\u003c\/p\u003e","brand":"King Seiko","offers":[{"title":"Default Title","offer_id":51862116630774,"sku":null,"price":1039.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7639\/5913\/files\/King_Seiko_4502_Chronometer_1.jpg?v=1791991161","url":"https:\/\/thesamuraivintage.com\/products\/vintage-watch-king-seiko-4502-8020-chronometer-batwing-case","provider":"Samurai Vintage Co.","version":"1.0","type":"link"}