Ronda 1013-21, 1113-21, 1213-21, 1313-21 Crown wheel Part No. 420 Swiss Watch.
Original Ronda Crown Wheel Part No. 420 designed for Ronda 1013-21, 1113-21, 1213-21, and 1313-21 Swiss watch movements. Suitable for watch repair, restoration, and movement servicing.
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