11 1/2”’ | Automatic | Swiss Lever | Indirect Sweeping Seconds | Date |

Remarks:

• Date with quick-setting
• Hackings seconds
• Automatic with uni-directional winding
• Two mainspring barrels coupled in series, one with fixed spring, one with slip spring
• Spirofin micrometer regulator
• Thinnest (2.95 mm) automatic movement with date and sweeping seconds when introduced in 1977
• Movement family:
  • Longines L989: automatic, especially for hour angle watch
  • Longines L990: automatic, indirect sweeping seconds, date
  • Longines L992: automatic, indirect sweeping seconds, no date
  • Longines L993: automatic, no seconds, no date
  • Longines L994: automatic, no seconds, date
  • Longines L995: manual winding, indirect sweeping seconds, date
  • Longines L996: manual winding, no seconds, date
  • Longines L997: manual winding, indirect sweeping seconds, no date
  • Longines L998: manual winding, no seconds, no date
  • Suffixes
    • .1: 25 jewels
    • .2: 17 jewels

• Listing ID: 18414
• Manufacturer / Brand: Longines
• Caliber: L990.1
• Size in French Lignes: 11 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Automatic
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: Date
• Jewels: 25
• Setting Lever Screw/Pin Position: Left
• Balance Position: Right (0 - 120°)
• Holes in setting lever spring or rocking bar: Not visible
• Shock Protection: KIF Ultraflex
• Beats per hour: 28,800
• Balance Type: Glucydur
• Power Reserve: 44 hours
• Production Period: 1977+
• Country: Switzerland
• Identification: Movement marked with LONGINES and L990.1.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)