DuRoWe 435

 
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DuRoWe 435

Description

The german jeweler Laco of Pforzheim had got an own movement manufacturer with the DuRoWe, the Deutsche Uhren-Rohwerke, which especiall in the 1950ies was famous for their well made and innovative movements. The DuRoWe 435 dates from the mid 1950ies and was available a short time only. It impresses by its unique geometrically shaped bridges.

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The diameter of that movement is the usual 10 12 and, like on any well made movement, all important bearings contain rubies for reducing the friction.

base plate

base plate

The minute wheel is directly driven, like it was usual that time, and it is beared under an own cock. Above, there’s the also driven center second.

minute wheel cock

minute wheel cock

A nice detail on that movement is, that all gears, except the escapement gear, are copper-colored instead of the usual brass tone color:

gear train

gear train

The DuRoWe 435 has got a screw balance, which is beared in two inhouse Duroswing shock protection systems, which were very new that time. It controls a typical pallet lever movement with directly driven center second, third wheel and central minute wheel.

side view of the gear train

side view of the gear train

On the dial side you see besides the two cap jewels (escapement- and third wheel - on both positions cap jewels are indeed useful) the large copper-colored changing wheel which a pin, which drives the date indication disc forth and back. The wheel is driven by the outer teeth of the hour wheel - a really simple and efficient construction.

date indication mechanism

date indication mechanism

The DuRoWe 435 is one of the compareable few movements, which has got a date disc instead of a date ring. Obviously, it was en vouge in the fifties to have the date window quite in the middle of the dial and not on the outside. But from the end fifties on, that changed, and the date window had to be as far from the dial center as possible, and so, only date rings, preferrable with a large diameter were used.

DuRoWe 435 dial side

DuRoWe 435 dial side

In the lab

The specimen shown here came in good condition in the lab, but for a best possible presentation, it was serviced, cleaned and regulated on the timegrapher.

On the timegrapher, it shows quite well figures, but they are very much position depending. Probably the balance wheel is aged.

Take the amplitude numbers with a grain of salt, since the correct lift angle is unknown and the usual default of 52° was used.

Timegrapher result



horizontal positions
dial up +20 s/d 210° 2.4ms
dial down +8 s/d 208° 2.2ms
vertical positions
crown right (12 up) -4 s/d 175° 3.0ms
crown up (3 up) -30 s/d 179° 3.0ms
crown left (6 up) -185 s/d 171° 2.7ms
crown down (9 up) -170 s/d 162° 2.8ms

Technical data

Manufacturer:DuRoWe
Caliber:435
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): Duro-Swing
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Features:SCD,QG
Functions:hour, minute, second, day
A/h:18000
Size:10 1/2''' (measured: 23,0mm)
Production period:1956-1957
Literature: Flume: 1957 33

Usage gallery

Adora mens' watch

Adora mens' watch

This movement, in combination with the Adora watch is a kind donation of Gundula Stein. Thank you very much!