CaliberDB

ETA 1257

Mechanical c. 1954 Self-winding (rotor)
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Notes

1954-1961, 11760102 (1256...1259) rotor-bearing clearance adjustable

Dimensions

Width25.6 lignes (57.75 mm)
Height5.9 mm
Stem height1.5 mm
Hands (H × M × S)1.5 × 0.9 × 0.2 mm

Technical data

Beat rate18,000 vph (2.5 Hz)
Lift angle—
Power reserve40 h
Jewels—
Shock protection—
Mobile stud carrierNo

Complications

Self windingRotor
Date No
Day No
HackingNo
ChronographNo

Mainspring

GR codeGR4122-X
Height1.5 mm
Thickness0.1 mm
Length300 mm
Barrel diameter9.5 mm