Longines L150 Movement Technical Reference | L150.2 Quartz & Battery

The Longines L150 family appears in several Gilded Hour catalogue records, including L150 and L150.2 quartz watches. The live records do not carry one consistent battery entry, so this page is an identification and service-reference guide rather than a blanket replacement chart.

Technical snapshot

Longines designation L150; related catalogue designation L150.2
Movement type Quartz, generally two-hand in the catalogue examples
Secondary base lead ETA 256.031 is a reported cross-reference; verify against the movement before treating it as confirmed
ETA 256.031 reference data 8¼ ligne, approximately 18.4 mm diameter, 1.95 mm thickness, 6 jewels
Battery reference lead ETA 256.031 sources list 315 / SR716SW; current Gilded Hour records also show SR616SW, SR516SW or no battery entry

Battery and interchange caution

The connected Shopify catalogue contains mixed L150/L150.2 battery data. That may reflect different variants, incomplete listing data or an incorrect entry. Confirm the movement stamp and the existing cell before ordering a replacement. Do not use an ETA 256.031 reference as proof that every L150 or L150.2 watch accepts the same movement, stem or battery.

Service notes

For a vintage quartz movement, check the battery compartment, contacts, coil, circuit and setting train before considering a replacement. Preserve the original movement and record its dimensions, stem position and hand heights if a service movement is being sourced.

Longines watches recorded with this calibre family

Sources and attribution

Gilded Hour archive note: This is an original research summary prepared for The Gilded Hour. It is not a reproduction of a Longines or ETA service manual. Calibre names, battery references and replacement suitability must be checked against the movement actually fitted to the watch.