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Zenith 57.8

Zenith 57.8Zenith 57.8

Description

The tiny ladies' watch form movement Zenith 57.8 was released in the late 1940ies in its predecessor version 57 (still with 18000 A/h) and was then relaunched in the 1950ies with the new beating rate of six half-beats per second.

Construction

 base platebase plate

The movement is a standard construction and still uses only 15 jewels, since at that time, it was not usual to bear the minute wheel in rubies.

gear traingear train

As common on form movements, the mainspring barrel uses almost half of the available space and so ensures a relatively long power reserve and a constant, hopefully low, deviation rate all over the day.

side view of the gear trainside view of the gear train

The beautiful golden toned Glucydur screw balance in not yet shock protected, but already beats with 21600 A/h, which is pretty unusual for such an old and time movement. And were also not many movement swith screw balance available, which had a beating rate of more than 18000 A/h.

As excapement, there's the conventional swiss pallet lever escapement.

Zenith 57.8 dial sideZenith 57.8 dial side

The decorations can not only be found on the movement side, but in reduced amount also on the dial side. Here, you can also see the yoke winding system.

 Technical data

ManufacturerZenith
Caliber57.8
Number of jewels15
EscapementAnchor with pallets
BalanceGlucydur screw balance
Shock protection(s)none
Balance cock directioncounterclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Construction typesolid construction
Winding mechanismyoke
Setting lever spring4 holes
Featuresh,m
Beats per hour21600
Size5''' (measured: 11.5 x 16.0 mm)
Image in Flume Werksucher 1949 152
Zenith 57.8ZenithZenith57.85'''Zenith 57.815 Jewels, 5''', 21600 A/h, h,m
Factsheet

Usage gallery

Zenith ladies' watch  (only dial)Zenith ladies' watch (only dial)