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This is a genuine Ronda winding stem for the 5021/5030/5040 movements, Swiss made, designed for the Startech 5000 series 12½ ligne chronograph calibers. It serves as the critical component connecting the crown to the keyless works for time setting, date quickset, and chronograph function control. Featuring Tap 10 (0.90mm) specification, this product is brand new and original, and typically requires cutting to case length during installation.
Part Number：3000.177（Ronda）/ 982004015000（Boley）
Compatible Movements：Ronda 5010.B, 5020.B, 5021.D, 5030.D, 5040.B, 5040.D, 5040.E, 5040.F, 5050.B, 5050.C, 5130.B, 5130.D
Origin：Swiss Made
Thread Diameter：0.90mm
1. Is this winding stem an original Ronda genuine part?
Yes.
2. Which movements is this stem compatible with?
It fits 5021.D, 5030.D, 5040.B/D/E/F and related 5010, 5020, 5050, 5130 Startech chronograph calibers. All these movements feature chronograph function and date display.
3. Does the stem need to be cut during installation?
The stem is supplied at a general length and must be cut to fit the specific case length before attaching the crown. Both standard (20mm) and long (32mm) versions are available. This should be performed by a qualified watchmaker.
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