Longines 992.1

Update

Basic Information

NameLongines 992.1
ManufacturerLongines
Launch Year1977
Caliber FamilyDescription
automatic:
989: especially for hour angle
990: date and seconds
992: no date
993: no date, no second
994: no second

manual wind:
995: date and seconds
996: no second
997: no date
998: no date, no second
suffix .1: 25 Jewels
suffix .2: 17 Jewels

Related calibers
Longines 989.2, Longines 990.1, Longines 990.2, Longines 992.1, Longines 992.2, Longines 993.1, Longines 993.2, Longines 994.1, Longines 994.2, Longines 995.2, Longines 996.2, Longines 997.2, Longines 998.2
Is COSC certifiedNo

Technical Details

Lignes Dimensions11.5 ‴
Dimensions26 mm
Height2.95 mm
Further MeasuresMounting Diameter (Dm): 25.6mm
Stem height (T): 1.0mm
Mounting Height (F): 0.6mm
Power Reserve40 hours
Frequency28,800 vph
Jewels25

Complications and Specifications

ShapeRound
Complications
  • Sweep Second
  • Chronograph Stopwatch
Shock ProtectionKIF
Regulator TypePinned Regulator (or Index Regulator)
Movement TypeAutomatic
Rotor TypeCentral Rotor
Escapement TypeSwiss Lever
Control TypeBalance Wheel
Winding TypeAutomatic (Rotor-Driven)
Setting TypeStem Set (Crown Pull)

Additional Information

Hand Sizes1.60 x 1.20 x 0.25mm
Hand Count3
Country Of ManufactureSwitzerland
NotesRemarks: 1977-
When introducted in 1977, the 990 with all features was the thinnest automatic movement with date and sweep second; even in 2003 it is only underscored by movements without date and/or sweep second.
micrometer regulator
two serially coupled barrels, one with fixed spring, one with slip spring
equivalent to Lemania 8810...
Signature1977: 53500047, Longines Swiss, 25 Jewels; Kif-Ultraflex (Longines 993.1)

Metadata

Created AtSep 15, 2023
Updated AtApr 23, 2025, 11:33:23 PM