This timepiece is a magnificent mechanical artifact from October 1973, as confirmed by the serial number 3O4078 .The 5 Actus SS (Second Setting) variants represented a premium tier within the Actus line, designed specifically for style-conscious Japanese professionals who valued both striking aesthetics and true horological utility. It houses the upper-grade Caliber 6106 movement, a technical soul featuring 25 jewels and a hacking mechanism (second setting) that stops the seconds hand when the crown is pulled out for precise time synchronization.
The architecture is outstanding, showcasing a robust stainless steel case with sweeping, angular lugs that integrate cleanly into the original factory bracelet. The dial is the absolute star of the show, sporting a rare, rich emerald teal-green sunburst finish that shifts dramatically under different lighting. It is uniquely detailed with massive, three-dimensional blocky indices, polished baton hands, and a bilingual calendar window at 3 o'clock. Complete with the unique push-in crown quickset mechanism for the day and date, this Japanese Domestic Market (JDM) vintage watch is a textbook example of Suwa Seikosha's bold 1970s design philosophy.
