This timepiece is a magnificent artifact from May 1985, as confirmed by the serial number 592092. The reference 2628-504A is defined by its substantial gold-toned rectangular case and a breathtaking cream rail-track dial featuring bold Arabic numerals and a dedicated small seconds sub-register at the 6 o'clock position. It is powered by the highly reliable Caliber 2628, a precision quartz engine engineered during the height of Seiko's design revolution to provide uncompromising accuracy in an architectural profile that sits with effortless grace on the wrist.

The architecture is quintessentially mid-80s executive-chic, utilizing a "stepped" bezel design that adds incredible depth and volume while maintaining a sophisticated, slim silhouette. The dial is a work of precision, featuring hand-applied baton indices and a unique "explorer" layout that bridges the gap between a professional tool watch and a formal dress piece. Flipping the watch over reveals the crisp stainless steel caseback with the BASE METAL / ST. STEEL BACK designation and the serial number 592092, definitively confirming its authentic Japanese Domestic Market (JDM) heritage. This is an essential acquisition for a connoisseur who appreciates unique dial complications, the mechanical soul of a precision quartz heart, and the bold, geometric presence of a vintage Seiko Tank.