Caliber reference
Miyota 2115 caliber: dimensions and drop-in group
The published footprint of the Miyota 2115 and which movements share it.
Used in: a widely used Japanese three-hand date quartz, in mid-range quartz watches.
A three-hand date quartz caliber at 23.30 mm x 3.60 mm, a step up in size from the 2035. It is its own quartz footprint and not a mechanical donor for any automatic.
Drop-in group: Miyota 2115 quartz three-hand (23.30 mm x 3.60 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 Miyota 2115drop-in lookup
Miyota 2115 vs Seiko VH31 (SII)drop-in comparison