Longines caliber series 99x and Lemania 88xx series
The L990 is celebrated for its ultra-thin construction (2.95 mm) and its twin mainspring barrels coupled in series, designed to deliver a steadier flow of torque and improved rate stability for an automatic this slim. The 990 architecture is celebrated for combining a remarkably slim profile with technical solutions uncommon in ultra-thin automatics – most notably double barrels coupled in series to support more stable running. After Longines discontinued the line, the design lived on under Nouvelle Lemania, appearing as the Lemania 8810 / 8815 family, later used by high-end makers (including Breguet).
Important Notes
- Dustproof only
- No water resistance warranty is provided
Dimensions
- Width (without crown): 32.9 mm
- Width (with crown): 35.3 mm
- Height (lug to lug): 38.4 mm
- Thickness: 7.3 mm
- Lug width: 17 mm








