{"product_id":"seiko-ref-7009-8100-cal-7009-mens-automatic","title":"Seiko, Ref. 7009-8100, Cal. 7009, Men’s Automatic, 1977","description":"\u003cp\u003eSeiko Automatic Ref. 7009-8100 from 1977 combines a broad 38 mm tonneau-shaped stainless-steel case, faceted crystal and clean silver dial with its original Seiko bracelet. This all-original example has been fully serviced and is currently running at approximately +3 sec\/day, preserving the distinctive proportions and integrated 1970s character of the reference.\u003c\/p\u003e\n\u003ch2\u003eTonneau Case Define the 7009-8100\u003c\/h2\u003e\n\u003cp\u003eThe case gives this Seiko a much stronger presence than a conventional round watch of the same period. At 38 mm wide and 42 mm lug to lug, the stainless-steel body uses broad brushed upper surfaces, polished bevels and sharply drawn shoulders that flow directly into the bracelet. The relatively short 42 mm length keeps the watch compact on the wrist despite its substantial width.\u003c\/p\u003e\n\u003cp\u003eThe case remains notably clean, with the original edges, brushing and polished transitions still clearly defined after nearly five decades.\u003c\/p\u003e\n\u003ch2\u003eSilver Dial with Blue Saturday Day-Date Display\u003c\/h2\u003e\n\u003cp\u003eThe silver dial uses a fine radial finish with applied baton hour markers and a sharply printed black minute track around the perimeter. A doubled marker at 12 o’clock adds just enough visual weight to the upper half, while broad luminous-filled hour and minute hands maintain a practical, legible layout. The applied SEIKO signature and AUTOMATIC text sit below 12, with 17 JEWELS positioned above 6.\u003c\/p\u003e\n\u003cp\u003eThe framed day-date aperture at 3 o’clock is one of the strongest period details, with the Saturday indication displayed in blue against the otherwise monochrome silver dial. A slim central seconds hand completes the three-hand layout. The dial is particularly well preserved, with clean printing, bright applied markers and only minimal visible aging, giving the watch a crisp appearance that complements the sharp case.\u003c\/p\u003e\n\u003ch2\u003eSeiko Cal. 7009 Automatic Day-Date Movement\u003c\/h2\u003e\n\u003cp\u003eInside is Seiko Cal. 7009, a 17-jewel automatic movement with central sweep seconds and day-date display. It operates at 21,600 vibrations per hour and offers approximately 43 hours of power reserve. The movement uses automatic winding rather than manual winding and incorporates Seiko’s practical calendar system for setting the day and date.\u003c\/p\u003e\n\u003cp\u003eThe movement has been fully serviced and is currently running at approximately +3 seconds per day under present test conditions. That is a strong observed rate for a 1977 automatic watch, while remaining a current measurement rather than a permanent accuracy guarantee. A 12-month movement warranty is included. Buyers comparing similar mechanical models can browse other \u003ca href=\"https:\/\/www.vintagewatchstudio.com\/collections\/automatic-vintage-watches\"\u003eautomatic vintage watches\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eOriginal Seiko Bracelet and Complete 1970s Configuration\u003c\/h2\u003e\n\u003cp\u003eThis example retains its original Seiko stainless-steel bracelet, an important part of the design because the broad end links continue the geometry of the tonneau case rather than interrupting it with a separate strap. The bracelet’s articulated rectangular links repeat the brushed and polished contrasts of the case and give the watch a cohesive, distinctly 1970s appearance.\u003c\/p\u003e\n\u003cp\u003eWith its original watch components, preserved silver dial, faceted crystal, original bracelet and serviced Cal. 7009 movement, Ref. 7009-8100 presents a particularly complete example of Seiko’s mechanical production from the late 1970s. Its angular case and integrated proportions also distinguish it clearly from the more conventional round designs found among many \u003ca href=\"https:\/\/www.vintagewatchstudio.com\/collections\/seiko-vintage-watches\"\u003evintage Seiko watches\u003c\/a\u003e of the same era.\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSeiko\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003ctd\u003e7009-8100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGender\u003c\/th\u003e\n\u003ctd\u003eMen’s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCaliber\u003c\/th\u003e\n\u003ctd\u003e7009\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProduction Year\u003c\/th\u003e\n\u003ctd\u003e1977 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDial Color\u003c\/th\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCase Diameter\u003c\/th\u003e\n\u003ctd\u003e38 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLug to Lug\u003c\/th\u003e\n\u003ctd\u003e42 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLug Width\u003c\/th\u003e\n\u003ctd\u003e19 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCase Material\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMovement Type\u003c\/th\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAccuracy\u003c\/th\u003e\n\u003ctd\u003e+3 sec\/day\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBracelet\u003c\/th\u003e\n\u003ctd\u003eOriginal Seiko stainless-steel bracelet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFully Serviced\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWarranty\u003c\/th\u003e\n\u003ctd\u003e12-month movement warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Seiko","offers":[{"title":"Default Title","offer_id":50538445144129,"sku":null,"price":350.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0668\/2768\/1857\/files\/seiko-7009-8100-cal7009-mens-automatic.webp?v=1790434397","url":"https:\/\/www.vintagewatchstudio.com\/products\/seiko-ref-7009-8100-cal-7009-mens-automatic","provider":"Vintage Watch Studio","version":"1.0","type":"link"}