Seiko SQ, Ref. 5Y23-8240, Cal. 5Y23, Men’s Quartz Analog

Seiko SQ 5Y23-8240 — two-tone early-1990s wrist presence

At 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.

Silver dial with gold-tone applied markers

The 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.

Wide day display and separate date aperture

The 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.

Stainless steel case with gold-plated accents

The 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.

Original two-tone Seiko bracelet B1754-E

The 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.

Compact 19 mm bracelet connection

The 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.

Seiko 5Y23 quartz caliber and daily practicality

The 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 quartz analog vintage watches with calendar functionality collection.

SQ design language at the start of the 1990s

The 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 Seiko vintage watches with late-20th-century Japanese design.

Serviced originality and present-day ownership

This 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.