Caliber reference
Ronda 1005 caliber: dimensions and drop-in group
The published footprint of the Ronda 1005 and which movements share it.
Used in: a three-hand Swiss quartz caliber at the 10 1/2 ligne size, in mid-size quartz watches.
A three-hand date quartz caliber at 23.30 mm x 2.50 mm, a size down from the 11 1/2 ligne 515. It is its own 1000-series footprint and does not share the 25.60 mm case fit.
Drop-in group: Ronda 10 1/2 quartz three-hand (23.30 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.
Drop-in and related calibers
Donor movement for Ronda 1005drop-in lookup
Seiko VH31 (SII) vs Ronda 1005drop-in comparison