EB 1438

Update

Basic Information

NameEB 1438
ManufacturerEbauches Bettlach
Launch Year1950
Caliber FamilyDescription
1197, 1343: 10.5" , sub second
1332, 1473, 1549, 1569, 1601: 11.5" , sub second
1362: 10.5" , sub second, day, date
1404, 1459: 10.5" , sweep second
1405, 1495: 11.5" , sweep second
1407: 11.5" , sub second, day, date
1438, 1465: 10.5" , sub second, date
1451: 10.5" , sweep second, date
1517: 11.25" , sub second
suffix N, -74: minor modifications and their year of introduction

Related calibers
EB 1197, EB 1197-74, EB 1197N, EB 1332, EB 1343, EB 1362, EB 1404, EB 1405, EB 1407, EB 1438, EB 1438N, EB 1451, EB 1459, EB 1465, EB 1473, EB 1495, EB 1517, EB 1549, EB 1569, EB 1601, EB 1601N
Is COSC certifiedNo

Technical Details

Lignes Dimensions10.5 ‴
Dimensions23.7 mm
Height(not set)
Further MeasuresMounting Diameter (Dm): 23.3mm
Power Reserve37 hours
Frequency18,000 vph
Jewels17
Lift Angle43 degrees

Complications and Specifications

ShapeRound
Complications
  • Sub Second
  • Date
  • Chronograph Second
Regulator TypePinned Regulator (or Index Regulator)
Movement TypeManual
Escapement TypePin Lever
Control TypeBalance Wheel
Winding TypeStem Winding (Crown)
Setting TypeStem Set (Crown Pull)

Additional Information

Hand Sizes1.30 x 0.80 / 0.22mm
Hand Count3
Country Of ManufactureSwitzerland
NotesRemarks: pin-lever escapement
ratchet on dial side, crown mechanism with rocker bar
differences not known between 1438, 1465
Other data: balance staff: U1388 stem: W1152 mainspring / battery: Zf1469, 1.80 x 9.0 x 0.10 x 290mm balance staff ronda: 5057 (10,5) balance staff ronda: 193 (10,5-11,5) stem ronda: 120 (10,5)
Ranfft mentioned about this caliber: There are variants with this quantity of jewels 7, 15, 17
Signatureca. 1950: 33, 6, Swiss Made, 15 Jewels - EB 1197 (EB 1197)

Metadata

Created AtSep 15, 2023
Updated AtApr 23, 2025, 11:31:49 PM