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This is a genuine Ronda winding stem for 505/515 movements, Swiss made. It serves as the critical mechanical component connecting the crown to the keyless works for time setting and date quickset functions. Featuring Tap 0.9mm specification and 20.5mm length, it fits Ronda 505, 507, 509, 515, 517, 519 calibers. This product is brand new and original, and typically requires cutting to case length during installation.
Part Number：3000.164 (also referenced as 401)
Compatible Movements：Ronda 505, 507, 509, 515, 517, 519
Origin：Swiss Made
Quality：Genuine original, brand new
Thread Spec：Tap 0.9mm
Length：20.5mm
1. Is this winding stem an original Ronda genuine part?
Yes. It is an original Ronda factory part from Switzerland (Part No. 3000.164).
2. Which movements is this stem compatible with?
It fits Ronda 505, 507, 509, 515, 517, 519 series calibers. The 505 measures 10½ ligne (23.90mm) and the 515 measures 11½ ligne (26.20mm).
3. Does the stem need to be cut during installation?
The stem has a length of 20.5mm and must be cut to fit the specific case length during installation before attaching the crown. This should be performed by a qualified watchmaker.
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