Tissot 27B.2-272024, Fourth wheel with pinion for sweep second

• TISSOT original part in very good used condition. (picture shows a NOS).

• Fits cal: 27B.2, 27B.21, 27B.621

Versions:

• 27B:            sub second. (1950 - 1961).
• 27B.1:         sub second, incabloc. (1950 - 1961).
• 27B.2:         sweep second. (1950 - 1961).
• 27B.21:       sweep second, incabloc. (1950 - 1961).
• 27B.61:       sweep second, date hand, incabloc. (1950 - 1961).
• 27B.621:     sweep second, date, incabloc. (1950 - 1961).
• 27B.9:         no second, incabloc. (1950 - 1961).