UNITAS Cal. 186, 187, 199 (10.5''') Winding stem - NOS - Ronda: 286
Manufacturer RONDA, Switzerland no: 286
- Fits cal: 186, 187, 187.1, 189, 198, 199, 199.1, 560, 561, 570, 571 (10.5''')
- Thread: 0.90 mm (D)
- A: = 69
- E: = 390
- B: = 88
- C: = 140
- D: = 90
- F: = 50
