Desa 321

 
Desa 321

Desa 321

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 321 presented here is such a pin lever movement, which is built on a large 13 ligne base plate. It belongs to the caliber family 220320, whose base movement has got a diameter of only 12 lignes, but is otherwise identical.

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.

There are no jewels on this movement, even the balance uses a simple brass finger instead of a ruby ellipse.

At 6 o’clock, there’s the riveted decentral seconds hand. It cannot be removed.

gear train

gear train

The gear train of the Desa 321 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.

The decentral seconds hand, which has got a smaller diameter than the second intermediate weel, is driven by the outer rims each.

side view of the gear train

side view of the gear train

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

mainspring barrel

mainspring barrel

Since a Roskopf movement uses no conventional hand gear train on the dial side, the hands have to be driven alternatively. For efficiency reasons, this is achived with two additional gears on top of the mainspring barrel.

mainspring barrel with slipping clutch

mainspring barrel with slipping clutch

The two gears are connected to the mainspring barrel with a slipping clutch.

dial side without hand tubes

dial side without hand tubes

Cannon pinion and hour wheel are both axle beared and driven by the barrel cover with minute wheel.

Desa 321: Dial side

Desa 321: Dial side

There’s no shock protection or ruby bearing for the balance wheel and gears, but on the other hand, the Desa 321 uses a real yoke winding system, like “better” movements do.

In the lab

Of the two no longer working specimen, one (at least in theory) working specimen was made. Unfortunately, main spring and the bearings are at the end of their life, so that the movement only runs for a few seconds.

Technical data

Manufacturer:Desa
Caliber:321
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, seconds wheel, third wheel, large driving wheel, mainspring barrel
Construction type:pillar construction
Winding mechanism:yoke winding system
Functions:hour, minute, decentral second
A/h:17280
Size:13''' (measured: 30,6mm)
Literature: Flume: K3 -
Inventory number:19016

Usage gallery

Cardinal gents watch  (case missing)

Cardinal gents watch (case missing)

Lucerne Electra gents watch (case missing)

Lucerne Electra gents watch (case missing)

This movement was donated by Lars Schröder. Thank you very much for your kind support of the movement archive.

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