Jaeger le Coultre 449, 450, 463, 478, 484 (12.5'''), Balance staff, Ronda: 1529
- Manufacturer Ronda no: 1529
- Total length: 335
- Fits cal: 449, 450, 463, 464, 468, 469, 478, 479, 484 (12.5''').
- A: = 335 (ronda A).
- B: = 175 (ronda B).
- F: = 45 (ronda K).
- G: = 100 (ronda J).
- H: = 49 (ronda G).
Conversion: Ronda to DCN
- A = A
- B = B
- J = G
- G = J
- K = F