Ronda 715 caliber: dimensions and drop-in group

Used in: a very thin Swiss three-hand quartz movement, in slim quartz dress watches.

A slim three-hand quartz caliber at 26.20 mm x 2.50 mm with a selectable date at 3 or 6. Thinner than the 500-series, it is its own 700-series footprint and pairs with the same-family 763.

Drop-in group: Ronda 700-series slim quartz (26.20 mm x 2.50 mm). 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.