Seiko - Chronos Silver-Champagne Brushed Dial Tsunami Caseback - 5H23-7040

This exceptionally sharp sports-dress heirloom is an authentic JDM artifact from August 1989, as definitively confirmed by the serial number 985429 stamped across the stainless steel screw-down caseback alongside the clear "JAPAN D" Daini production mark and the iconic relief Seiko Tsunami Wave medallion. Originating from Seiko’s revered Chronos lineup, this reference bridges formal dress aesthetics with heavy-duty tool watch engineering, boasting factory 10-bar water resistance and 60-gauss antimagnetic shielding designed for demanding daily environments. It houses the robust Seiko Caliber 5H23 quartz movement, an over-engineered workhorse caliber renowned for its high-torque stepping motor, set-and-forget accuracy, and reliable bilingual English/Kanji day-date calendar mechanism. 

The case architecture presents a streamlined gold-plated profile defined by angular integrated lugs, a smooth rounded bezel, and a recessed crown guarded within the case flank at 3 o'clock. The dial is a study in Japanese minimalist balance, showcasing a fine vertically brushed champagne-silver sunburst surface appointed with slim, applied black-accented baton hour markers, matching needle hands, an outer minute track, and a metallic framed quickset day-date aperture. Fitted to its original, period-correct Seiko-signed five-link gold-plated bracelet with a folding clasp, this late-1980s JDM classic delivers radiant wrist presence backed by genuine dive-grade caseback pedigree.