12 1/2”’ | Hand Wind | Swiss Lever | Indirect Sweeping Seconds | Alarm |

Remarks:

• Common mainspring for wheel train and alarm
• Rocking bar winding
• Alarm duration: 10 seconds
• Crown at 2 H: Setting the alarm time (anticlockwise)
• Button at 4 H: Alarm is switched off when button is pulled out
• Also built as Bulova 12 B (= J98-2) with 17 jewels
• Used in the Junghans Minivox watch series

• Listing ID: 5751
• Manufacturer / Brand: Junghans
• Caliber: J89 / 689.70
• Size in French Lignes: 12 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Other Functions: Alarm
• Jewels: 20, 21
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: Junghans II
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance with Nivarox hairspring
• Power Reserve: Approx. 36 hours
• Production Period: 1951 – 1958
• Country: Germany
• Identification: Wheel train bridge marked with Junghans logo an 89. Listed in many movement identifiers.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-66#post-9259175