Tissot 27B.1-271029B, Balance staff for Incabloc

• NOS TISSOT original balance staff, not in factory packaging.

• Fits cal: 27B.1, 27B.2, 27B.21, 27B.621, 27B.9 with Incabloc shock protection.
  

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).