IWC 57, 58 H6 (18-19'''), Balance staff, Ronda: 1344
- Manufacturer Ronda no: 1344
- Total length: 524
- Fits cal: 57, 58 H6 (18-19''').
- A: = 524 (ronda A).
- B: = 263 (ronda B).
- F: = 97 (ronda K).
- G: = 125 (ronda J).
- H: = 53 (ronda G).
Conversion: Ronda to DCN
- A = A
- B = B
- J = G
- G = J
- K = F