The Watch: The IW375609 is one of the most technically impressive executions in the GST (Gold, Steel, Titanium) line from IWC, a perpetual calendar chronograph housed in a 43mm stainless steel case with a fully integrated bracelet.
Released in the late 1990s, this reference combines a Valjoux-based automatic chronograph with a full perpetual calendar module by Kurt Klaus, IWC’s legendary master watchmaker. The movement tracks day, date, month, year (including leap years), and moonphase, all without requiring manual correction until 2100. It’s all controlled via the crown no pushers or stylus needed.
The case measures 43mm across and 15mm thick, with a distinctive brushed finish that gives the watch its robust, technical appeal. The integrated bracelet maintains IWC’s signature tool-watch aesthetic while offering an elegant taper and excellent wrist presence. It fits up to a 7.25" wrist.
This example features a clean white dial with luminous hands, and four subdials: day + running seconds, date, month + chronograph hours, and moonphase + chronograph minutes. A full calendar and chronograph in a steel sports case is a rare combination, and this one delivers it with IWC’s classic Teutonic charm.
Includes: Watch only
Condition: Excellent. Light wear consistent with age, bracelet and case remain strong. Bracelet fits up to 7.25".
This is a collector’s piece in every sense: a full complication in a steel sports watch, built to last and designed with real purpose.
