Ultra 41

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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

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