{"product_id":"serviced-vintage-1971-japan-seiko-5-sports-speed-timer-6138-0020-21j-automatic","title":"Serviced Vintage 1971 JAPAN SEIKO 5 SPORTS SPEED-TIMER 6138-0020 21J Automatic.","description":"\u003cbr\u003e\u003ch3 style=\"font-size: 32px; color : #2B0000; margin-bottom: 36px;\"\u003eServiced Vintage 1971 JAPAN SEIKO 5 SPORTS SPEED-TIMER 6138-0020 21Jewels 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\u003e5 SPORTS SPEED-TIMER 6138-0020 21Jewels \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 : 61 5 SPORTS SPEED-TIMER.\u003c\/li\u003e\n\u003cli\u003eCaliber number : 6138A,B.\u003c\/li\u003e\n\u003cli\u003eMovement : Automatic.\u003c\/li\u003e\n\u003cli\u003eBeat rate : 21800bph.\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 : 142740.\u003c\/li\u003e\n\u003cli\u003eDial number : JAPAN 6138-0030T.\u003c\/li\u003e\n\u003cli\u003eGlass : Crystal.\u003c\/li\u003e\n\u003cli\u003eCase size : About 42.16mm.\u003c\/li\u003e\n\u003cli\u003eLug width : 20mm.\u003c\/li\u003e\n\u003cli\u003eBand : New Leather Strap.\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\u003eFunction is good.\u003cbr\u003eDay of the week can be set in English or Kanji. \u003cbr\u003eQuick set(Day\/Date) : Okay.\u003cbr\u003eSet of the days of the week  : The set at one stage pulling the crown.\u003cbr\u003eSet 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\u003e\u003cb style=\"color : red\"\u003eOverhaul service in February  2026.\u003cbr\u003eThe movement has been cleaned and oiled, so it works fine.\u003c\/b\u003e\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 Pinnacle of Automatic Chronographs (1971):\u003c\/b\u003e By **1971**, Seiko was at the forefront of the global race for automatic chronographs. The reference **6138-0020** was a flagship of the **5 Sports Speed-Timer** line, designed for the \"\"active generation.\"\" It showcased Seiko’s dominance in precision timing, being one of the first reliable, mass-produced automatic chronographs with both a 12-hour and 30-minute recorder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Legendary Caliber 6138:\u003c\/b\u003e This watch is powered by the **21-jewel Caliber 6138**, a robust high-beat heart operating at **21,600 vibrations per hour (vph)**. Horologically, it is famous for featuring a **column wheel and a vertical clutch system**—features typically found only in the most expensive Swiss chronometers today. Unlike its predecessor (the 6139), the 6138 added **manual winding capability**, making it a favorite for its mechanical versatility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIconic \"\"Tokei Zara\"\" Helmet Case:\u003c\/b\u003e The reference **6138-0020** is legendary for its unique, futuristic case shape, often nicknamed the **\"\"Helmet\"\"** or **\"\"Tokei Zara\"\" (Clock Dish)** in Japan. In **1971**, this bold, streamlined design—with its hidden lugs and towering profile—represented the height of Space Age industrial aesthetics, ensuring the watch stood out as a specialized instrument on the wrist.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRacing-Inspired Dial and Tachymeter:\u003c\/b\u003e Designed for the racetrack, this model features a high-contrast dial with an internal tachymeter scale. The dual-subdial layout at 12 and 6 o'clock provides a perfectly balanced vertical symmetry. In **1971**, the use of vibrant orange or yellow chronograph hands was a deliberate choice to ensure **split-second legibility** during high-speed activities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe \"\"5 Sports\"\" Pedigree:\u003c\/b\u003e As part of the **Seiko 5 Sports** family, the 6138-0020 met five essential criteria: automatic winding, day-date calendar, water resistance, a recessed crown, and a durable case. Produced by the **Suwa Seikosha** factory, it remains one of the most culturally significant and collectible chronographs in Seiko’s history, embodying the spirit of 1970s innovation.\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\/g1217337421.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":52078119518529,"sku":"g1217337421","price":185000.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/8205\/0625\/files\/57_891f573e-e35c-4fbb-a094-c6453deba4c0.jpg?v=1786515555","url":"https:\/\/nonkun.com\/products\/serviced-vintage-1971-japan-seiko-5-sports-speed-timer-6138-0020-21j-automatic","provider":"NONKUN Japan","version":"1.0","type":"link"}