Desa 322

 
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Desa 322

Description

Desa (Ebauches Desa) was one of the manufacturers of pin lever movements, which are rare to find, although their movements have got exactly the same constructions as those of many other manufacturers like Baumgartner.

The Desa 322 shown here is such a pin levermovement, which builds on a large, 13 ligne base plate. It belongs to the caliber family 220320, whose base ebauche has got a diameter of only 12 lignes, but has got an identical construction.

base plate

base plate

The base plate shows the construction with transmission wheel on the base plate. The yoke winding system with its lever and spring can also be seen here.

gear train

gear train

The gear train of the Desa 322 follows the Roskopf construction with the extra large mainspring barrel, which covers the center of the base plate. Because of this, one transmission step could be saved.

side view of the gear train

side view of the gear train

This Roskopf construction is also the reason, why the non shock-protected ring balance beats with the crooked number of 17280 A/h. The escapement is a traditional pin lever escapement.

pin lever

pin lever

The fork of the lever is on the top, since the intervention of the balance happens with a finger and not with an ellipse.

Desa 322 dial side

Desa 322 dial side

As common on Roskopf movements, the hour and minute wheels are both driven by a moveable clutch on the mainspring barrel.

The Desa 322 has got no jewels for bearings (except one of the balance) and no shock protection.

In the lab

The specimen shown here was in good condition and required only a minimal service and an adjustment, since at the beginning, it ran four minutes fast per day.

Timegrapher result

The results on the timegrapher averaged at about zero, but there's a large difference between horizontal and vertical rates, but that's no surprise for a 1 jewel movement.

horizontal positions
dial up +29 s/d
dial down +34 s/d 0.6ms
vertical positions
crown right (12 up) -9 s/d 1.7ms
crown up (3 up) -40 s/d 0.8ms
crown left (6 up) -19 s/d 0.8ms
crown down (9 up) -16 s/d

Technical data

Manufacturer:Desa
Caliber:322
Number of jewels:1
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, third wheel, large driving wheel, mainspring barrel
Construction type:pillar construction
Winding mechanism:yoke winding system
Functions:hour, minute
A/h:17280
Size:13''' (measured: 30,55mm)
Literature: Flume: K3 -
Inventory number:16007

Usage gallery

Lucerne pendant watch

Lucerne pendant watch

This movement and pendant watch was donated by Günter G. Thank you very much for supporting the movement archive!