Alpina 273 (18.5'''), Balance staff, DCN: 307

• DCN no: 307
• Length: 466
• Fits caliber: 273, 274 (18.5'''). Base caliber: Unitas 31

• A: = 466
• B: = 221
• 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.