Powematic 80-series movement adapted to show the 'open heart' dial side.
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 hair spring.
All watches using this caliber:
T063.907.22.038.01 Tissot Tradition Powermatic 80 Open Heart 40 Stainless Steel / Rose Gold PVD / Silver / Bracelet
T063.907.22.038.00 Tissot Tradition Powermatic 80 Open Heart 40 Stainless Steel / Yellow Gold PVD / Silver / Bracelet