Tissot 27B-621 in working condition. Serial number 4342308 indicates that watch is made in 1959y Original leather strap is in poor condition Ligne: 12''' Jewels: 16 Power Reserve: 44 hrs Frequency: 18000 vph Type: Manual Wind Period used: 1950-1961 Diameter: 27 mm Height: 5.7 mm Hands: 1.40 x 0.80 x 0.20 mm The Tissot 27B-621 is a manually wound mechanical watch movement that was in use between 1950 and 1961. It features a sweep second function, a date display, and a calendar. Additionally, it is equipped with Incabloc shock protection for improved durability and reliability. The Tissot 27B-621 features the following functions: Calendar Date Incabloc Shock Protection Manual Winding Sweep second