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This is a genuine Ronda 505 date wheel, an original Swiss-made component for the Ronda 505 quartz movement. It serves as the core component of the calendar display mechanism, responsible for automatically advancing the date numeral at midnight. The Ronda 505 date wheel is available in multiple date window positions (3H, 4H, 4:30, 6H, etc.) and colors (white, black, etc.). This product is brand new and original, not a generic replacement part.
Brand：Ronda (Swiss)
Compatible Movement：505 quartz movement (10½ ligne xtratech series)
Part Name：Date Wheel
Origin：Swiss Made or Swiss Parts (1 jewel, nickel)
Quality：Genuine original, brand new
Function：Drives date display
1. Is this date wheel an original Ronda genuine part?
Yes. It is an original Ronda factory part, Swiss Made.
2. Which movements is this date wheel compatible with?
It fits the Ronda 505 series quartz movement, measuring 10½ ligne with 23.90mm diameter and 3.00mm thickness, part of Ronda’s xtratech product line, featuring 3 hands and date display. The 505 is partially compatible with 507, 509, 517, 519 series—verify date position before installation.
3. What happens if the date wheel is damaged?
The date wheel is the core component of the calendar mechanism. Damage can cause the date to fail to advance, skip, or jam, affecting calendar function. As a wear-prone component, timely replacement is recommended.
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