Ultra 421

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18 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

  • Movement family:
    • Ultra 41: Monometallic screw balance with Breguet hairspring, no shock protection
    • Ultra 410: Monometallic screw balance with flat hairspring, Incabloc shock protection
    • Ultra 420: Monometallic screw balance with flat hairspring, Antichoc 102 shock protection, different balance cock compared to calibers 41, 410
    • Ultra 421:  Minimal changes on the dial side compared to caliber 420: polished setting lever spring, Drilled hole around the escape wheel jewel, presumably for attaching a cap jewel
  • Listing ID: 2812
  • Manufacturer / Brand: Ultra
  • Caliber: 421
  • Size in French Lignes: 18 1/2'''
  • Size range mm largest diameter: > 40 mm
  • Shape: Round
  • Winding: Manual (Crown)
  • Hands Setting: Crown
  • Seconds Hand: Small seconds
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date, Day, Month...: None
  • Jewels: 15
  • Setting Lever Screw/Pin Position: Right
  • Balance Position: Right (0 - 120°)
  • Shock Protection: Antichoc 102
  • Beats per hour: 18,000
  • Balance Type: Monometallic screw balance with flat hairspring
  • Power Reserve: Unknown
  • Production Period: Unknown, probably from around the end of the 1950s
  • Identification: Marked with Ultra logo and 421 under the balance.
  • External Link: https://watch-movements.eu/blog/en/2018/07/01/ultra-watches-and-movements-from-france/
  • Country: France
  • Contributor ©: Uhrforum.de member Badener (Andreas Kelz)

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