Tissot Powermatic 80 Open Heart Watch. The Powermatic 80 movement is even more precise thanks to its silicon balance spring that offers additional resistance to the magnetic fields we encounter in everyday life. With 80 hours of power reserve, it’s a movement that can keep pace with busy lifestyles. These Gentleman models are truly an impressive offering. Watch Details: Water Resistance: up to a Pressure 10 Bar (100M/330 FT) Case: Round, 40 mm Lugs: 21.00 Crystal: Domed Sapphire Crystal with Anti-Reflective Coating Movement: Swiss Automatic Power Reserve; up to 80 Hours Dial: Blue with Indexes Strap/Chain Reference: T605047822 Strap Details: Stainless Steel , Butterfly Clasp, Interchangeable Release Bracelet