Drop-in resolution
Ronda 505 vs Ronda 705: do they swap?
Whether the Ronda 505 and Ronda 705 share a case, and what changes if you move between them.
Close in diameter, not a drop-in. The Ronda 505 (25.60 mm x 3.10 mm) and Ronda 705 (26.20 mm x 2.50 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 505 is a three-hand Swiss quartz caliber in the 500 family, at the 11 1/2 ligne size. The Ronda 705 is a slim no-date member of the Ronda 700 quartz family.
They differ in diameter (25.60 mm vs 26.20 mm), height (3.10 mm vs 2.50 mm), calendar layout (centre seconds, date at 3, small seconds sub-variant vs centre seconds, no date, slim), winding behaviour. A 500-family three-hand quartz caliber at 25.60 mm x 3.10 mm, sharing the 515's diameter and stem. It swaps within a matching three-hand dial with the 515, 513S and 6004.B.
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.