The Durowe 61 is a mid-size ladies' form watch movement, which was used in the 1950ies.
Its size of 6 3/4 x 8 lignes is noteable, since at that time, mostly smaller form movements of
5 1/2 lignes were used.
The larger size allowes especially the use of a larger balance wheel and a larger mainspring
barrel, which both leads to higher precision and running time. The only problem is, that larger
cases were needed, but for a good case designer, this was an easy one to solve.
THe construction of that movement is well known: The screw balance is already beared
in two inhouse shock protection bearings; the effective length of the hairspring can only be regulated
at the hairspring key and its end is fix attached to the balance cock with its interesting
shape here.
A pallet lever controls the movement. Its position of the axes is a bit unusual, since
three of them, fourth, third and second wheel are in one ligne. The escapement wheel has got a cap
jewel on the movement side. Altogether, the Durowe 61 uses 17 jewels, two more, than most of the
movement of that time use.
The 18000 A/h are standard for a movement of the 1950ies.
This movement was developed further and its last incarnation can be found in the late
1960ies in the caliber 89.
dial side view
On the dial side, there are no surprises: It uses a yoke winding system, and at position
"12:30", you can spot the inhouse Duro-Swing shock protection bearing.
Technical data
Manufacturer
DuRoWe
Caliber
61
Number of jewels
17
Escapement
Anchor with pallets
Balance
Nickel screw balance
Shock protection(s)
Duro-Swing
Balance cock direction
counterclockwise
Hairspring stud
fixed
Regulator type
Hairspring key
Movement construction
Fork Escapement wheel, Fourth wheel, Third wheel, Center wheel Mainspring barrel
Construction type
solid construction
Bridge shape
4 gears, 3 in one line
Winding mechanism
yoke
Setting lever spring
4 holes
Functions
Hour, minute
Beats per hour
18000
Size
63/4 x 8''' (measured: 15,2 x 17,8 mm)
Production time
1953 - ~1963
Image in Flume Werksucher
1957 47
Factsheet
Test Results
The specimen shown here came in good shape and strongly running into the lab. Due to its
small size, and the difficult cleaning process, it was not cleaned at all. You can get
a good impression of the performance of a movement, which was not serviced for years.
Timegrapher Protocol
On tiny movements, good timing results are hard to achieve. When, additionally, the last
service was long ago, it's quite impossible, and that is exactly, what you can see here: In all
positions, the movement shows large deviation numbers, but in the mean (e.g. when being worn),
they are reduced to fair amounts.
dial down
dial up
12 up
3 up
6 up
9 up
Measured Values
horizontal positions
dial down
+70 seconds/day
dial up
+85 seconds/day
vertical positions
12 up
-80 seconds/day
3 up
+10 seconds/day
6 up
-45 seconds/day
9 up
-100 seconds/day
timegrapher measurings
A power reserve was not measured, but it was much more than 24 hours.
