Drop-in resolution
Ronda 763 vs Ronda 762: do they swap?
Whether the Ronda 763 and Ronda 762 share a case, and what changes if you move between them.
Same footprint, different calendar. The Ronda 763 and Ronda 762 share the 15.30 x 18.10 mm x 2.50 mm case fit, but the Ronda 763 is centre seconds, date at 3 and the Ronda 762 is centre seconds, no date, so a swap needs a dial cut for the new layout.
The Ronda 763 is a small oval-form Swiss quartz movement, in ladies and small dress watches. The Ronda 762 is a small oval-form Swiss quartz movement without date, in small dress watches.
They differ in calendar layout (centre seconds, date at 3 vs centre seconds, no date). A small form caliber at 15.30 x 18.10 mm and 2.50 mm tall, shaped for compact and ladies cases. Its footprint has nothing in common with the 11 1/2 ligne core, so it only pairs with same-size small Ronda quartz calibers.
Matching diameter and height is necessary but not sufficient. A donor is only a true drop-in when the dial-foot positions, hand-hole sizes, stem length and calendar layout also match. Two movements can share a case and still need a new dial, re-broached hands or a cut-to-length stem.