Ronda 4003.B

The Ronda 4003.B is a quartz chronograph movement from the 400x family, produced by the Swiss manufacturer Ronda. It features multi-function capabilities typical of the 400x series, offering stopwatch and additional timekeeping functions beyond basic time display. The movement is manufactured in-house by Ronda and remains in production. It is widely used by various watch brands requiring reliable quartz chronograph functionality.