Sinn 103 St Chronograph watch

Sinn Spezialuhren is a prestigious German watch manufacturer founded in 1961 by Helmut Sinn, a former aviation instructor and pilot. The brand is world-renowned for its high-performance, functional timepieces, particularly pilot and diving watches. The model shown is the Sinn 103, a classic pilot chronograph that has been a cornerstone of the brand's catalog for decades.

Sinn watches are primarily manufactured in Frankfurt am Main, Germany. The company is notable for its 'Made in Germany' pedigree and its development of proprietary technologies such as TEGIMENT hardness technology, Ar-Dehumidifying Technology, and DIAPAL escape-wheel systems. Under the leadership of Lothar Schmidt, who acquired the company in 1994, Sinn has remained an independent entity, focusing on technical innovation rather than mass-market luxury marketing.