507 Ronda Watch Movement

The Harley Ronda quartz movement is a three-hand (hour, minute, sweep seconds) gents movement made with Swiss parts, featuring a horizontal day display and a date at the 3 o’clock position. It measures 10½ lignes (23.30 mm in diameter) with an overall height of 3.00 mm and a movement height classification of H1. This movement has one jewel, nickel plates, operates on a 371 battery, and uses standard hand dimensions of 120/70/20. The most accurate way to determine the correct movement height when replacing a movement is to measure the height of the hour wheel on the original movement; for an H1 movement, the hour wheel height is 1.75 mm.