Ruhla UMF 24-39

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10 3/4”’ | Hand Wind | Pin Lever | No Seconds | Alarm

Remarks:

Rocking bar winding
Click on the dial side
Alarm realized by an electric buzzer that is triggered by closing an electric circuit between the dial and the movement
Motifications during production:
- 1966: three-armed spring on regulator
- 1975: movable instead of fixed hairspring stud-holder, and other small modifications
- 1976: rocking bar made of plastic
Movement family:
- Ruhla UMF 24-24: 0 jewels, dot display (transparent discs instead of hands)
- Ruhla UMF 24-26: 0 jewels, child’s watch with moving eyes
- Ruhla UMF 24-30: 0 jewels, no seconds
- Ruhla UMF 24-31: 0 jewels, small seconds
- Ruhla UMF 24-32: 0 jewels, indirect sweeping seconds
- Ruhla UMF 24-33: 0 jewels, indirect sweeping seconds, date
- Ruhla UMF 24-34: 0 jewels, digital display, bigger base plate
- Ruhla UMF 24-35: 0 jewels, indirect sweeping seconds with stop mechanism
- Ruhla UMF 24-36: 0 jewels, digital display
- Ruhla UMF 24-39: 0 jewels, traveling miniature alarm clock (Midimatic, Sumatic)
- Ruhla UMF 24-41: 2 jewels, small seconds
- Ruhla UMF 24-42: 2 jewels, indirect sweeping seconds

Listing ID: 10974
Manufacturer / Brand: Ruhla UMF
Caliber: 24-39
Size in French Lignes: 10 3/4''' (10 1/2''' according to the manufacturer)
Size range mm largest diameter: 22 - 31 mm
Shape: Round
Winding: Manual (Crown)
Hands Setting: Crown
Seconds Hand: None
Escapement: Pin Lever
Date, Day, Month...: None
Other Functions: Alarm
Jewels: 0
Setting Lever Screw/Pin Position: Left
Balance Position: Bottom (120 - 240°)
Shock Protection: None
Beats per hour: 18,000
Balance Type: Nickel
Power Reserve: Approx. 36 hours
Production Period: 1963 - 1990 (whole movement family)
Identification: Dial side marked with 24-00. Original datasheet available. Listed in the Flume K3 catalog from 1972.
External Link 2: https://watch-movements.eu/blog/en/2024/12/01/the-umf-24-39-for-ruhla-sumatic-and-midimatic-alarm-clocks/
Country: Germany