{"product_id":"seiko-prospex-hbc003j1-speedtimer-mechanical-men-watch","title":"SEIKO PROSPEX HBC003J1 SPEEDTIMER MECHANICAL MEN WATCH","description":"\u003ch2\u003eSeiko HBC003J1 — Prospex Speedtimer Mechanical Automatic\u003c\/h2\u003e\n\n\u003cp\u003eThe Seiko HBC003J1 is a mechanical Speedtimer from Seiko's Prospex collection — a three-hand automatic powered by the 6R55 calibre with a 72-hour power reserve, housed in a 39.5 mm stainless steel case with a curved sapphire crystal, a rotating inner ring, and 200 m water resistance. This is not a chronograph — the Speedtimer Mechanical takes the motorsport-inspired Speedtimer design language and distils it into a clean three-hand automatic with a rotating inner bezel ring that can be used for elapsed-time tracking or as a reference marker. The light blue dial with LumiBrite on hands and hour markers keeps things legible in any light, and the 6R55 calibre — the same movement found in the Presage Classic and Prospex Diver 300M — delivers the reliability of a 72-hour power reserve with +25\/-15 seconds per day accuracy.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSeiko 6R55 automatic calibre — 72-hour power reserve, hand-winding capability, screw case back, Made in Japan (J1)\u003c\/li\u003e\n  \u003cli\u003eThree-hand analogue display with date — clean, focused dial layout\u003c\/li\u003e\n  \u003cli\u003eLight blue dial with baton indices — fresh, contemporary colour in a motorsport-inspired case\u003c\/li\u003e\n  \u003cli\u003eRotating inner ring — internal bezel ring for elapsed-time tracking or personalised reference marking\u003c\/li\u003e\n  \u003cli\u003e39.5 mm stainless steel case — compact, sport-forward proportions\u003c\/li\u003e\n  \u003cli\u003eCurved sapphire crystal — premium scratch resistance with a contoured profile\u003c\/li\u003e\n  \u003cli\u003eLumiBrite on hands and hour markers — full low-light legibility\u003c\/li\u003e\n  \u003cli\u003e200 metres water resistance — professional-grade water resistance for swimming, snorkelling, and active use\u003c\/li\u003e\n  \u003cli\u003eStainless steel bracelet in silver — robust all-metal daily-wear package\u003c\/li\u003e\n  \u003cli\u003eScrew case back — sealed for water integrity under pressure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\n\u003cp\u003eThe HBC003J1 is the Prospex for the buyer who wants the 6R55's 72-hour power reserve and the Speedtimer's motorsport design language in a clean three-hand watch — no chronograph pushers, no sub-dials, just hours, minutes, seconds, date, and a rotating inner ring. The 39.5 mm case is more compact than the 41.4 mm solar Speedtimer chronographs and the 41.7 mm Prospex divers, making it the most wrist-friendly Prospex in the current range. The 200 m water resistance means it is built for genuine active use — swimming, snorkelling, and water sports — while the curved sapphire crystal and clean dial layout keep it refined enough for everyday wear. The same 6R55 calibre powers watches at higher price points in the Presage Classic line — the HBC003J1 delivers it in a sportier, more compact package.\u003c\/p\u003e\n\n\u003ch3\u003eHBC003J1 vs SPB481J1 (Diver 300M) vs SSC939P1 (Speedtimer Solar Chrono)\u003c\/h3\u003e\n\u003cp\u003eThe HBC003J1 has the 6R55 automatic (72hr, 3-hand, rotating inner ring), 39.5 mm case, curved sapphire, and 200 m WR — the compact mechanical Speedtimer. The SPB481J1 has the same 6R55 but in a 41.3 mm diver's case with unidirectional bezel, 300 m diver's WR, and screw-down crown — the dive tool. The SSC939P1 has the V192 solar calibre with a 60-minute chronograph, tachymetre, 41.4 mm case, and 100 m WR — the motorsport timing instrument. Three Prospex watches, three different expressions of professional specification.\u003c\/p\u003e\n\n\u003ch3\u003eThe Seiko Story\u003c\/h3\u003e\n\u003cp\u003eSince 1881, when Kintaro Hattori founded a clock and watch shop in Ginza, Tokyo, Seiko has been at the forefront of timekeeping innovation — from the world's first quartz wristwatch in 1969 to today's GPS Solar and Spring Drive technologies. Seiko's Prospex (Professional Specifications) line carries a legacy of precision instruments built for extreme environments. The Speedtimer name has been part of Seiko's motorsport heritage since 1969, and the HBC003J1 carries it forward as a mechanical three-hand watch — the purest, most refined expression of the Speedtimer concept.\u003c\/p\u003e\n\n\u003cp\u003eBacked by Seiko's official warranty. Authentic Seiko Prospex, sold by authorised retailer City Chain Singapore.\u003c\/p\u003e\n\n\u003cp\u003eExplore more \u003ca href=\"\/collections\/seiko-prospex\" title=\"Seiko Prospex at City Chain Singapore\"\u003eSeiko Prospex\u003c\/a\u003e, browse the full \u003ca href=\"\/collections\/seiko\" title=\"Seiko watches at City Chain Singapore\"\u003eSeiko collection\u003c\/a\u003e, or see all \u003ca href=\"\/collections\/men\" title=\"Men's watches at City Chain Singapore\"\u003eMen's watches\u003c\/a\u003e at City Chain Singapore.\u003c\/p\u003e","brand":"SEIKO","offers":[{"title":"Default Title","offer_id":49663126831319,"sku":"HBC003J1","price":1417.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/2451\/7272\/files\/Seiko_HBC003J1.png?v=1788247041","url":"https:\/\/www.citychain.com.sg\/products\/seiko-prospex-hbc003j1-speedtimer-mechanical-men-watch","provider":"City Chain Singapore","version":"1.0","type":"link"}