About MovementSwap
Find the drop-in donor movement for any popular watch caliber
The popular mechanical calibers share a handful of physical footprints. Pick the caliber you have and find the movement that drops into the same case: matching diameter, height, stem position and hand fitting, plus the traps that make two movements the same size but still not interchangeable.
Movement dimensions are compiled from official manufacturer technical documents: ETA (Swatch Group), Sellita, Citizen Miyota, Seiko Instruments / Time Module (TMI) and Ronda, plus published caliber references. Every figure is cited on the page it appears on.
Dimensions are quoted from official maker datasheets and cited on each page. Same casing diameter and height do not guarantee a drop-in: dial-foot positions, hand-hole sizes, stem length and calendar layout must also match. Verify against the datasheet and your own case before ordering a donor movement.
Operated by Westcountry Hosting Ltd.