Founded in 1961 in Frankfurt am Main, Germany, Sinn Spezialuhren is renowned for producing highly functional instrument watches designed for professional use. The brand is celebrated for its engineering-driven approach, clarity of design, and uncompromising focus on reliability. The 103 collection is one of Sinn’s most iconic chronograph lines, closely associated with aviation and classic pilot chronographs.

The Sinn 103 ST Chronograph, reference 103.035, features a 41 mm stainless steel case with a matte black dial, white Arabic numerals, and high-contrast chronograph subdials for outstanding legibility. Powered by the automatic Sellita SW510 movement (based on the Valjoux 7750 architecture), it offers a 48-hour power reserve, a frequency of 28,800 vph, and functions including central chronograph seconds, 30-minute and 12-hour counters, small seconds, day-date display at 3 o’clock, and hacking seconds.

A domed plexi glass, while the captive pilot-style bezel with minute scale adds functional versatility. With 200 meters of water resistance and a screw-down crown, the Sinn 103 ST is built to perform reliably in demanding conditions. This example is supplied on a stainless steel bracelet with folding clasp with the ratcheting clasp and includes an additional black leather strap, offering versatile wearing options.

This Sinn 103 ST is from August 2024, is in near mint condition. Comes as a full set (box and papers).