Drop-in resolution
Ronda 715 vs Ronda 505: do they swap?
Whether the Ronda 715 and Ronda 505 share a case, and what changes if you move between them.
Close in diameter, not a drop-in. The Ronda 715 (26.20 mm x 2.50 mm) and Ronda 505 (25.60 mm x 3.10 mm) are near in size but differ in height, dial feet or layout, so moving between them means a new dial, hands and often a case adjustment.
The Ronda 715 is a very thin Swiss three-hand quartz movement, in slim quartz dress watches. The Ronda 505 is a three-hand Swiss quartz caliber in the 500 family, at the 11 1/2 ligne size.
They differ in diameter (26.20 mm vs 25.60 mm), height (2.50 mm vs 3.10 mm), calendar layout (centre seconds, date at 3 or 6 vs centre seconds, date at 3, small seconds sub-variant), winding behaviour. 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.
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.