Tissot 27-27025, Fourth wheel w. sec-hand bit

• NOS TISSOT original part, not in factory packaging.
  

• Fits cal: 27, 27PC, 27-1, 27-3, 27-63, 27-7, 27T, 27-1T sub second.
  

Versions:

• 27:            sub second. no shock protection.
• 27 PC:       sub second, shock resist.
• 27 PC SC:  sweep second, shock resist.
• 27-1:         sub second, incabloc. (1949 - 1951).
• 27-2:         sweep second. (1936 - 1938).
• 27-3:         sub second, shock resist. (1940 - 1942).
• 27-23:       sweep second, shock resist. (1940 - 1942).
• 27-53:       chronograph 60 s Mediostat, shock resist. (1940 - 1942).
• 27-63:       sub second, date hand, shock resist. (1944 - 1945).
• 27-7:         sub second, super shock resist. (1948).
• 27-T:         sub second. (1950 - 1952).
• 27-1T:       sub second, incabloc. (1950 - 1952).
• 27-2T:       sweep second. (1950 - 1952).
• 27-21T:     sweep second, incabloc. (1950 - 1952).
• 27-61T:     sub second, date hand, incabloc. (1950 - 1952).
• 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).