13”’ | Hand Wind | Swiss Lever | Small Seconds | Date |

Remarks:

• Unitas Movement family (see extra picture):
  • Unitas 6325: Small seconds
  • Unitas 6326: Small seconds, different bridge shapes
  • Unitas 6335: Indirect sweeping seconds
  • Unitas 6336: Indirect sweeping seconds, different bridge shapes
  • Unitas 6420: Indirect sweeping seconds, date
  • Unitas 6421: Indirect sweeping seconds, date, different bridge shapes
  • Unitas 6422: Indirect sweeping seconds, date, day
  • Unitas 6423: Indirect sweeping seconds, date, day, different bridge shapes
  • Unitas 6425: Small seconds, date with quick-setting
  • Unitas 6426: Small seconds, date with quick-setting, different bridge shapes
  • Unitas 6427: No seconds, date, day, bothe with quick-setting
  • Unitas 6428: No seconds, date, day, bothe with quick-setting, different bridge shapes

• Listing ID: 6237
• Manufacturer / Brand: Unitas / Dugena
• Caliber: Unitas 6425 = Dugena 3910
• Size in French Lignes: 13'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: Date
• Jewels: 17
• Setting Lever Screw/Pin Position: Right
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Incabloc
• Beats per hour: 21,600
• Balance Type: Nickel
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1972
• Identification: Marked with UT 6425 under the balance wheel, and with Dugena 3910 on the ratchet wheel. Listed in the Flume K3 catalog from 1972.
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)