Longines 17.25, 18.25, 19.25 (17-19'''), Balance staff, Ronda: 912

• Manufacturer Ronda no: 912

• Total length: 445

• Fits cal: 17'''  17.25, 17.27, 17.79, 17.89
• Fits cal: 18'''  18.25, 18.79, 18.80, 18.89, 18.90
• Fits cal: 19'''  19.25, 19.26, 19.79, 19.80Z, 19.80ZZ

• A: = 445 (ronda A).
• B: = 218 (ronda B).
• F: =   80 (ronda K).
• G: = 130 (ronda J).
• H: =   56 (ronda G).

Conversion: Ronda to DCN

• A = A
• B = B
• J = G
• G = J
• K = F