Eta Caliber 2851

ETA Caliber 2851

Eta Caliber 2851 Front Back Drawings

Manufacturer ETA
Caliber Number 2851
Base Caliber
ETA 2850
Family
ETA 2800 series “Gabarit”
Movement Type Mechanical, manual-wind
Lignes 11.5”’
Diameter
25.6mm
Height
4.3mm
Jewel Count
Varies
Beat Rate
21,600 vph, 3 Hz
Lift Angle
52 degrees
Power Reserve
~38 hours
Hand-Windable?
Yes
Anti-Shock Device
Incabloc
Hand Count 3
Hand Sizes
1.5mm / .90mm / .25mm
Functions Central hours; central minutes; central sweeping seconds
Hacking Seconds?
Yes
Country of Manufacture Switzerland, Swiss made
Known Models
(Add your watch to the comments below…)

The ETA caliber 2851 is a vintage time-only manual-wind mechanical movement. It is a true no-date movement.

This caliber is an early member of the ETA 28XX family of movements (Gabarit).

Documentation for this caliber was found as far back as 1976.

2851 VS 2850:

The ETA calibre 2851 is basically a lower beat rate version of the cal. 2850. The 2850 beats at 28,800 vph (4 Hz) and the 2851 has a frequency of 21,600 vph (3Hz).

Additional Resources:

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