8 3/4”’ | Automatic | Swiss Lever | Sweeping Seconds | Date |

Remarks:

• The movement belongs to a family of movements 413x, 423x, 433x, 443x
  413x: 8 3/4”’
  423x: 10 1/2”’
  433x: 11 1/2”’
  443x: 12”’
  x = 1: Hand winding, two hands
  x = 3: Hand winding, three hands with sweeping seconds
  x = 5: Hand winding, three hands with sweeping seconds, date
  x = 7: Hand winding, three hands with sweeping seconds, date, day
  x = 8: Automatic, three hands with sweeping seconds, date
  x = 9: Automatic, three hands with sweeping seconds, date, day
  Not all combinations were available.
• Interesting variant for semi-quick adjustment of the date: When the time is set backwards, the date is advanced by one day every 30 minutes

• Listing ID: 4095
• Manufacturer / Brand: Ronda
• Caliber: 4138
• Size in French Lignes: 8 3/4''', height 5.60 mm
• Size range mm largest diameter: 0 - 22 mm
• Shape: Round
• Winding: Automatic
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: Date
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: KIF Protechoc
• Beats per hour: 21,600
• Balance Type: Nickel
• Power Reserve: Unknown
• Production Period: Approx. late 1970s to early 1980s
• Identification: Movement marking and original documents from Ronda.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-15#post-2728912
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)