The Tissot 33.3 chronograph movement is a vintage mechanical movement produced by Tissot in the mid-20th century, specifically in the 1930s and 1940s. It is a manually wound movement with 17 jewels and a frequency of 18,000 vibrations per hour (2.5 Hz).
The Tissot 33.3 movement was used in some of Tissot's most iconic chronograph watches of the era. It also has a Breguet hairspring, which is known for its accuracy and is typically found in higher-end mechanical movements. Overall, the Tissot 33.3 chronograph movement is highly valued by collectors of vintage Tissot watches for its classic design, high-end features, and reliable performance.