Tissot 28.1-440, Yoke spring

• NOS TISSOT original part, no: 28015

• Fits cal: 28.1, 28.21, 28.5.1, 28.5.21, 28.5N.21, 31.1, 31.21

Data: Tissot cal: 28.5.1

• 17 jewels, automatic wind, sub second.
• Size: 28,5 mm (12,5''').
• H: = 5,05 mm.
• N: = 19.800 A/h.
• Power reserve: 40 h.

Versions:

• 28.1:           sub second.
• 28.21:         sweep second.
• 28.5.1:        sub second, plate with mounting flange.
• 28.5.21:      sweep second, plate with mounting flange.
• 28.5 N.21:   sweep second, second time zone, Navigator.
• 31.1:           sub second, bigger plate.
• 31.21:         sweep second, bigger plate.