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Seiko The Seashell Duet

The first sensation is the rhythmic weight of the integrated bracelet—a series of polished Mercury links that feel like smooth river stones shaped by time.

Case: 16 mm
Lug to Lug: 24 mm
Bracelet: 8 mm
Max Wrist: 16 cm

Excellent vintage condition · Circa 1999

Will it fit? How to measure your wrist

Wrap a strip of paper or a soft tape snugly around your wrist, just below the wrist bone. Mark where it overlaps, then measure that length in centimetres.

If your wrist is the same as or smaller than the Max Wrist size above, it should fit. A watchmaker can usually shorten a vintage bracelet, but extra links are rarely available.

Not sure? Send us your wrist size on WhatsApp.

What our condition grades mean

Excellent: Minimal signs of wear, visible only on close inspection.
Very Good: Light surface wear consistent with age, such as fine hairline scratches. Nothing that affects wear or function.
Good: Visible signs of age, such as scratches or patina, all shown in the photos. Fully functional.

Every watch is checked for function and timekeeping before it is listed, and the photos show the actual piece.

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SpecificationsThe Details

Brand	Seiko
Case width	16 mm
Lug to lug	24 mm
Lug/Bracelet width	8 mm
Max wrist size	16 cm
Case material	Polished Base Metal / Stainless Steel Back
Dial	Flat Frost White with Roman XII
Crystal	Domed Mineral Glass
Movement	Japan Seiko Quartz 1F20
Production era	Circa 1999
Condition	Excellent vintage condition

The StoryAbout This Piece

The first sensation is the rhythmic weight of the integrated bracelet—a series of polished Mercury links that feel like smooth river stones shaped by time. Each link is designed to catch the light in sharp, metallic flashes, mimicking the way moonlight breaks across a calm lake. On the wrist, it possesses a cool, substantial presence that feels more like a heavy silver vine than a traditional timekeeper, providing a quiet, tactile groundedness with every movement.

Tracing its lineage back to the late 1990s, this Seiko Exceline represents the height of Japanese technical miniaturization. Powered by the high-precision caliber 1F20, it reflects the era’s pursuit of a jewelry-first aesthetic without compromising horological integrity. The oval Frost dial is punctuated by a classic Roman numeral at twelve and shielded by an arched crystal, while the case features delicate accents that sparkle like morning dew. It is a functional piece of industrial sculpture, preserved in its original box—a relic for the collector who finds beauty in the intersection of high precision and organic form.