EB 8120

Update

Basic Information

NameEB 8120
ManufacturerEbauches Bettlach
Launch Year1965
Caliber FamilyDescription
8.75" , automatic:
8100: sub second
8101: indirect sweep second
8103: direct sweep second
8104: sub second, date
8105: indirect sweep second., date
8107: direct sweep second, date

11.5" , automatic:
8120: sub second
8121: indirect sweep second
8123: direct sweep second
8124: sub second, date
8125: indirect sweep second., date
8127: direct sweep second, date

8.75" , manual wind:
8140: sub second
8141: indirect sweep second
8143: direct sweep second
8144: sub second, date
8145: indirect sweep second., date
8147: direct sweep second, date

Related calibers
EB 8100, EB 8101, EB 8103, EB 8104, EB 8105, EB 8107, EB 8120, EB 8121, EB 8123, EB 8124, EB 8125, EB 8127
Is COSC certifiedNo

Technical Details

Lignes Dimensions11.5 ‴
Dimensions25.94 mm
Height5 mm
Further MeasuresMounting Diameter (Dm): 25.6mm
Power Reserve32 hours
Frequency18,000 vph
Jewels21
Lift Angle49 degrees

Complications and Specifications

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

Additional Information

Hand Sizes1.30 x 0.90mm
Hand Count3
Country Of ManufactureSwitzerland
NotesRemarks: pin-lever escapement
Other data: balance staff: U3028 stem: W3024 mainspring / battery: 1.25 x 7.5 x 0.085mm balance staff ronda: 4888 (8,75) stem ronda: 1306 (11,5)
Signatureca. 1965: Swiss, 21 Jewels; Kif-Trior (EB 8127)

Metadata

Created AtSep 15, 2023
Updated AtFeb 9, 2024, 6:27:44 PM