Judex 46 SC (Sefea 53)

 
Judex 46 SC (Sefea 53)

Judex 46 SC (Sefea 53)

Description

The identification of this golden toned, 8 3/4 ligne windup movement was not easy, most likely it is a Judex 46 SC, which was probably later renamed to Sefea 53.

base plate

base plate

At first glance, this 21 jewel movement does not seem special, nevertheless, the arrangement of the four, equipped with red rubies, bearings on the base plate is a little unusual. No less interesting is the transparend bearing jewel with its screwed-in mounting at 8 o’clock.

gear train

gear train

If you take a closed look, you see the interesting construction of the gear train:

The mainspring barrel directly drives the center minute wheel, followed by third wheel, center seconds wheel, double pinion (at 5:30 o’clock), seconds wheel (at 6 o’clock) and steel escape wheel.

Especially the seconds wheel without pinion and the double pinion are noteworthy!

side view of the gear train

side view of the gear train

Once again the decentral seconds wheel at the 6 o’clock position (bottom left on the photo). Its only function is, via the double pinion (slanted on the photo), to directly drive the top center seconds wheel.

intermediate seconds wheel without pinion

intermediate seconds wheel without pinion

The lower gear train bridge (the very fact alone that there are two bridges is remarkable!) is only used for bearing the minute wheel and escape wheel.

gear train bridge, first layer

gear train bridge, first layer

The axle of the seconds wheel (without pinion) and the double pinion are passed through to the upper gear train bridge, where their bearings have got a cap jewel each.

side view, first layer

side view, first layer

The second layer of the gear train consists of the third wheel (whose axle is passed through to the base plate) and the center seconds wheel. The latter one is engaged with the double pinion, which is passed through from the first layer.

The third wheel in turn drives with its pinion, which is passed through to the first layer, the center minute wheel.

gear train, second layer

gear train, second layer

Who has not yet discovered the fascination of the overall construction has to take a look at the side view. At the latest now everyone - and rightly - ask why a movement with a direct sweep second had to be constructed so incredibly complex.

side view gear train, second layer

side view gear train, second layer

The description of the regulator is much more sober: The golden-toned screw balance is secured and beared in a three-leg shock protection and beats slowly with 18000 alternations per hour. The exact frequency can only be found on adjusted on the hairspring key directly.

As escapement, a conventional swiss pallet lever escapement is used.

Judex 46 SC: Dial side

Judex 46 SC: Dial side

On the dial side, this movement is pretty normal. Of course, it uses a yoke winding system, and at 9 o’clock, you can see the three-leg shock protection with its brass bearing.

Technical data

Manufacturer:Judex
Caliber:46 SC
Number of jewels:21
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): ?
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, transmission axle
  • third wheel, center second pinion
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:SCD
Functions:hour, minute, second
A/h:18000
Size:8 3/4''' (measured: 19,3mm)
Inventory number:19025

Usage gallery

Amberte ladies' watch

Amberte ladies' watch

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