{"product_id":"seiko-spb507-prospex-alpinist-automatic","title":"Seiko SPB507 Prospex Alpinist 39.5mm Green Automatic Watch","description":"\u003ch2\u003eSeiko SPB507 Prospex Alpinist 39.5mm Green Automatic Watch\u003c\/h2\u003e\u003cp\u003eA green sunray dial, gold-tone numerals and brown leather strap give the Seiko SPB507 its recognizable Alpinist character. The Prospex design traces its inspiration to Seiko's 1959 mountaineering watch, with an Alpinist logo on the dial and a rotating inner compass bezel for outdoor-oriented styling and use.\u003c\/p\u003e\u003cp\u003eThe 6R55 automatic movement offers manual winding and approximately 72 hours of power reserve. A transparent screwdown caseback displays the movement and Alpinist mountain emblem, while LumiBrite hands and markers help with low-light reading. The magnified date window keeps the calendar easy to find.\u003c\/p\u003e\u003cp\u003eIts super-hard-coated stainless steel case is 39.5 mm wide, 12.7 mm thick and 46.4 mm from lug to lug. Sapphire crystal has anti-reflective coating on the inner surface. A screwdown crown and 20 bar water-resistance rating complete the case; consider the leather strap when planning water exposure.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMovement: Automatic with manual winding, caliber 6R55\u003c\/li\u003e\n\u003cli\u003ePower reserve: Approximately 72 hours\u003c\/li\u003e\n\u003cli\u003eCase: Stainless steel with super-hard coating\u003c\/li\u003e\n\u003cli\u003eCase diameter: 39.5 mm\u003c\/li\u003e\n\u003cli\u003eCase thickness: 12.7 mm\u003c\/li\u003e\n\u003cli\u003eLug-to-lug: 46.4 mm\u003c\/li\u003e\n\u003cli\u003eLug width: 20 mm\u003c\/li\u003e\n\u003cli\u003eCrystal: Sapphire with inner anti-reflective coating and date magnifier\u003c\/li\u003e\n\u003cli\u003eDial: Green sunray with gold accents\u003c\/li\u003e\n\u003cli\u003eBand: Brown leather strap\u003c\/li\u003e\n\u003cli\u003eBezel: Rotating inner compass\u003c\/li\u003e\n\u003cli\u003eCrown: Screwdown\u003c\/li\u003e\n\u003cli\u003eWater resistance: 20 bar \/ 200 meters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHow does the SPB507 differ from earlier Alpinist models?\u003c\/h3\u003e\u003cp\u003eThis reference uses the 6R55 automatic caliber with approximately 72 hours of power reserve, along with the Alpinist dial logo and mountain emblem on its transparent caseback. Specifications should be compared by exact model.\u003c\/p\u003e\u003cp\u003eExplore \u003ca href=\"\/collections\/seiko-watches\"\u003eSeiko watches\u003c\/a\u003e or \u003ca href=\"\/pages\/contact-us\"\u003econtact Watch Technicians\u003c\/a\u003e for model and fit advice.\u003c\/p\u003e","brand":"Seiko","offers":[{"title":"Default Title","offer_id":45560287035568,"sku":"SPB507","price":900.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0509\/8887\/5952\/files\/seiko-spb507-front.png?v=1792755531","url":"https:\/\/shop.watchtechnicians.com\/products\/seiko-spb507-prospex-alpinist-automatic","provider":"Watch Technicians","version":"1.0","type":"link"}