MovementSwap

Close in diameter, not a drop-in. The Ronda 6004.B (25.60 mm x 3.30 mm) and ETA 955.112 (25.60 mm x 3.15 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. Published dimensions, layout and the checks before you swap one for the other.

Updated 05 September 2026.

Drop-in resolution

Ronda 6004.B vs ETA 955.112: do they swap?

Whether the Ronda 6004.B and ETA 955.112 share a case, and what changes if you move between them.

Adapter needed

Close in diameter, not a drop-in. The Ronda 6004.B (25.60 mm x 3.30 mm) and ETA 955.112 (25.60 mm x 3.15 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 6004.B is a long-battery-life Swiss quartz three-hander in mid-range watches. The ETA 955.112 is a common Swiss three-hand quartz caliber, the ETA rival to the Ronda 515.

They differ in height (3.30 mm vs 3.15 mm), winding behaviour. A three-hand date quartz caliber at 25.60 mm x 3.30 mm with an extended battery life of up to ten years. It shares the 11 1/2 ligne diameter of the Ronda 515 and swaps within a matching three-hand dial.

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.

Calibers and lookups

Ronda 6004.B25.60 mm x 3.30 mm
ETA 955.11225.60 mm x 3.15 mm
Donor movement for Ronda 6004.Bdrop-in lookup
Donor movement for ETA 955.112drop-in lookup

Questions and answers

Ronda 6004.B vs ETA 955.112: do they swap?

Close in diameter, not a drop-in. The Ronda 6004.B (25.60 mm x 3.30 mm) and ETA 955.112 (25.60 mm x 3.15 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.