Alpina 277 (18.5'''), Balance staff, DCN: 308

• 
  DCN no: 308
• 
  Length: 360
• 
  Fits caliber: 277, 278 (18.5'''). Base caliber: Unitas 33

• 
  A: = 360
• 
  B: = 188
• 
  F: = 81
• 
  G: = 125
• 
  H: = 61

Versions:

• 
  273: H: = 5.35 mm, Lép.
• 
  274: H: = 5.35 mm, Sav.
• 
  277: H: = 4.15 mm, Lép.
• 
  278: H: = 4.15 mm, Sav.