Omega 37.5-1321 (140), Balance staff, DCN: 921

• DCN no: 921

• Fits cal: 37.5, 37.5 T1, 140, 142

• A: 306
• B: 160
• F: 90
• G: 131
• H: 67

Versions:

• 37.5 15 P: 15 jewels, 1932
• 37.5 17 P: 17 jewels, 1932
• 37.5 T1 15 P: base caliber 140, 15 jewels, 1941
• 37.5 T1 17 P: base caliber 142, 17 jewels, 1941