{"product_id":"seiko-sq-ref-5y23-8240-cal-5y23-mens-quartz-analog","title":"Seiko SQ, Ref. 5Y23-8240, Cal. 5Y23, Men’s Quartz Analog","description":"\u003cp\u003eVintage Seiko SQ Quartz Analog from 1990 is a Men’s Japanese quartz watch powered by the 5Y23 caliber, combining a silver dial, gold-tone accents, quickset day-date display and an original two-tone bracelet. Offered for sale with a refined early-1990s character, this all-original example balances everyday practicality with a distinctive sports-dress presentation.\u003c\/p\u003e\u003ch2\u003eSeiko SQ 5Y23-8240 — two-tone early-1990s wrist presence\u003c\/h2\u003e\u003cp\u003eAt 37 mm across and 42 mm lug to lug, this Seiko SQ has balanced proportions that feel substantial without becoming oversized. The stainless steel case uses broad polished and brushed surfaces, while gold-plated accents on the crown, dial furniture and bracelet add warmth. Its integrated-looking bracelet transition and rounded case shoulders create a smooth sports-dress profile typical of the period.\u003c\/p\u003e\u003ch3\u003eSilver dial with gold-tone applied markers\u003c\/h3\u003e\u003cp\u003eThe dial has a light silver finish with a restrained radial texture. Applied rectangular hour markers combine gold-tone borders with darker inner sections, producing clear contrast against the pale surface. A fine printed minute track surrounds the dial, while the SEIKO and QUARTZ signatures sit below 12 o’clock. The small SQ emblem above 6 adds a period-specific detail without crowding the layout.\u003c\/p\u003e\u003ch3\u003eWide day display and separate date aperture\u003c\/h3\u003e\u003cp\u003eThe calendar arrangement is one of the strongest visual features. A wide framed weekday window sits beneath 12 o’clock, while a separate date aperture appears at 3. The supplied data identifies the 5Y23 as providing a quickset day-date function, making the complication practical as well as visually distinctive. Gold-tone hour and minute hands and a slender central seconds hand complete the display.\u003c\/p\u003e\u003ch2\u003eStainless steel case with gold-plated accents\u003c\/h2\u003e\u003cp\u003eThe confirmed case material is stainless steel with gold-plated detailing. Broad polished flanks contrast with brushed upper surfaces, giving the case more depth than a uniformly finished dress watch. The crown at 3 o’clock is gold-tone and ridged for practical setting. Light age-related marks are visible on the exterior, but the overall presentation remains clean and coherent.\u003c\/p\u003e\u003ch3\u003eOriginal two-tone Seiko bracelet B1754-E\u003c\/h3\u003e\u003cp\u003eThe watch retains its original Seiko bracelet, identified in the supplied data as bracelet B1754-E. Its broad steel outer links are combined with gold-tone central elements, extending the two-tone design directly from the case. The articulated construction gives the watch a more complete factory look than a replacement strap would provide, while the mixed finishes reinforce its early-1990s character.\u003c\/p\u003e\u003ch3\u003eCompact 19 mm bracelet connection\u003c\/h3\u003e\u003cp\u003eThe 19 mm lug width creates a neat transition between the case and bracelet. Because a specific fitted wrist circumference is not supplied, the listing does not state an exact wrist size. The bracelet remains an important part of the original watch configuration and visually balances the 37 mm case with enough width to preserve a confident stance.\u003c\/p\u003e\u003ch2\u003eSeiko 5Y23 quartz caliber and daily practicality\u003c\/h2\u003e\u003cp\u003eThe confirmed 5Y23 caliber is a Japanese quartz movement designed around straightforward analog timekeeping and a day-date complication. Battery-powered operation removes the need for regular winding while preserving the familiar three-hand display. The watch is confirmed as serviced and fully operational, supporting practical daily use. Similar pieces can be compared in our \u003ca href=\"\/collections\/quartz-analog-vintage-watches\"\u003equartz analog vintage watches with calendar functionality\u003c\/a\u003e collection.\u003c\/p\u003e\u003ch2\u003eSQ design language at the start of the 1990s\u003c\/h2\u003e\u003cp\u003eThe SQ line reflects Seiko’s mature quartz era, when reliable electronic movements were paired with increasingly refined case and bracelet designs. This 1990 example combines a silver dial, two-tone metalwork and a prominent weekday display in a format that sits between formal and everyday wear. Buyers exploring the maker can also browse our \u003ca href=\"\/collections\/seiko-vintage-watches\"\u003eSeiko vintage watches with late-20th-century Japanese design\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eServiced originality and present-day ownership\u003c\/h2\u003e\u003cp\u003eThis Seiko is confirmed as serviced, fully operational and all original. The original bracelet is specifically identified in the supplied information, and no replacement strap is involved. The dial remains clean and legible, while the case and bracelet show light age-related wear consistent with vintage use. No box or papers are included, and the watch is supplied with a 12-month warranty.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSeiko\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSQ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference\u003c\/td\u003e\n\u003ctd\u003e5Y23-8240\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eVery Good Vintage Condition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGender\u003c\/td\u003e\n\u003ctd\u003eMen’s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCaliber\u003c\/td\u003e\n\u003ctd\u003e5Y23\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCategory\u003c\/td\u003e\n\u003ctd\u003eQuartz Analog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduction Year\u003c\/td\u003e\n\u003ctd\u003e1990 year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDial Color\u003c\/td\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Diameter\u003c\/td\u003e\n\u003ctd\u003e37 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLug to Lug\u003c\/td\u003e\n\u003ctd\u003e42 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLug Width\u003c\/td\u003e\n\u003ctd\u003e19 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWrist Size\u003c\/td\u003e\n\u003ctd\u003eAdjustable bracelet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase Material\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\/Gold Plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMovement Type\u003c\/td\u003e\n\u003ctd\u003eQuartz Analog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBox\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePapers\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFully Serviced\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFully Operational\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOriginal Watch Components\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e12 Months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Seiko","offers":[{"title":"Default Title","offer_id":44494213349441,"sku":null,"price":290.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0668\/2768\/1857\/files\/seiko-sq-ref-5y23-8240-cal-5y23-mens-quartz-analog.webp?v=1788037109","url":"https:\/\/www.vintagewatchstudio.com\/products\/seiko-sq-ref-5y23-8240-cal-5y23-mens-quartz-analog","provider":"Vintage Watch Studio","version":"1.0","type":"link"}