ETA 256.031 Quartz Movement | Longines L150 Equivalent Reference
The ETA 256.031 is the most useful equivalent reference for the Longines L150 family identified in the Gilded Hour archive. This page is an original Gilded Hour technical summary, not a reproduced ETA service manual.
Technical snapshot
| ETA calibre | 256.031 Long Life quartz |
|---|---|
| Longines relationship | Longines L150 is cross-referenced to ETA 256.031 in movement reference data; L150.2 is a related Longines designation and must be checked by variant |
| Size | 8¼ ligne; approximately 18.20–18.40 mm diameter |
| Thickness | 1.95 mm |
| Display | Hours and minutes |
| Jewels | 6 |
| Battery reference | 315 / Renata R315; some supplier references also show SR716SW equivalents |
Replacement and service guidance
The ETA 256.031 is a reference point, not a promise of drop-in interchange. Compare diameter, thickness, stem position, hand heights, dial feet, battery clamp and case clearance before sourcing a replacement. One parts listing specifically warns that the stem is not interchangeable with the related E61031 reference.
The connected Gilded Hour catalogue contains L150 and L150.2 records with mixed battery entries, including SR616SW, SR516SW and incomplete data. Confirm the movement engraving and existing cell before battery replacement.
Related Gilded Hour Longines records
- Longines L150 movement archive
- Longines Gold Tone Cushion Watch
- Longines Conquest Mini Women’s Bracelet
Sources and attribution
- Jules Borel Longines movement reference list
- ETA 256.031 reference data from Jules Borel
- ETA 256.031 supplier parts and battery listing
Identification note: ETA, Longines and related calibre names are used for reference and identification. Always have a trained watchmaker confirm the movement before ordering parts.