Self-winding 'Powermatic 80' movement with central seconds, date, and additional 24-hour hand.
Within the Powermatic family of movement's there are -thus far- three different levels;
C07.1XX; these have a synthetic escapement.
C07.6XX; these have a regular escapement.
C07.8XX; these have a silicon balance spring.
All watches using this caliber:
T099.429.11.038.00 Tissot Chemin Des Tourelles Powermatic 80 GMT 42 Stainless Steel / Silver / Bracelet