Ultra 904
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10 1/2”’ | Hand Wind | Swiss Lever | Direct Sweeping Seconds |
Remarks:
- The Ultra 904 has some visual similarities with the French Parrenin 90, but is not identical to it
- Listing ID: 2789
- Manufacturer / Brand: Ultra
- Caliber: 904
- Size in French Lignes: 10 1/2'''
- Size range mm largest diameter: 22 - 31 mm
- Shape: Round
- Winding: Manual (Crown)
- Hands Setting: Crown
- Seconds Hand: Sweeping seconds (central seconds)
- Escapement: Lever (Swiss, English, Glashütte)
- Date, Day, Month...: None
- Jewels: 17
- Setting Lever Screw/Pin Position: Left
- Balance Position: Bottom (120 - 240°)
- Shock Protection: Incabloc
- Beats per hour: 18,000
- Balance Type: Mono-/Bimetallic screw balance with Breguet hairspring | Glucydur | Nickel | Brass
- Power Reserve: Unknown
- Production Period: Unknown, probably around 1955
- Identification: Ratchet wheel marked with ULTRA 904. Original data sheet available.
- External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-33#post-4138736
- Country: France
- Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
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