Longines L817 Movement Technical Reference | L817.4 Manual-Wind & Service Notes

The Longines L817 name appears in the connected Gilded Hour catalogue in both mechanical and contradictory quartz records. The verified technical reference below focuses on the L817.4 manual-winding movement; individual watches must still be checked against their movement engraving.

Technical snapshot

Longines designation L817.4 manual wind
Movement type Mechanical, hand-wound
Jewels 17 jewels in the technical references consulted
Diameter 15.30 mm
Overall height 2.90 mm
Power reserve Approximately 44 hours
Battery None; this is a mechanical movement

Identification and service notes

The L817.4 technical material describes a self-lubricated mainspring, a screwless monometal balance, shock protection, Triovis regulation and a standard lever escapement. The movement should be wound carefully until resistance is reached; do not force the crown.

Some current Gilded Hour L817 records contain quartz or “no battery required” wording even where the descriptive copy identifies a manual-wind watch. Treat the movement engraving and photographs as the controlling evidence. A mechanical L817.4 is not interchangeable with a quartz movement.

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.