Ultra 420
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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: 2807
- Manufacturer / Brand: Ultra
- Caliber: 420
- 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 U 420 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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