16 1/2”’ | Hand Wind | Swiss Lever | Small Seconds | Chronograph |

Remarks:

• Chronograph:
  • Mono-pusher
  • Column wheel actuated
  • Central chronograph seconds
  • 30 min counter at 12H
• Based on French patent FR671111 from 1929
• Movement family:
  • Marnay: trademark of pocket watches with this movement: jumping chronograph minutes
  • Oberlin: trademark of pocket watches with a slightly different movement, sweeping chronograph minutes

• Listing ID: 18524
• Manufacturer / Brand: Geismar
• Caliber: Tachy Chrono-Graphe Oberlin
• Size in French Lignes: 16 1/2''' (outer diameter 17 1/4''')
• Size range mm largest diameter: 31 - 40 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Other Functions: Chronograph
• Jewels: 17?
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Holes in setting lever spring or rocking bar: 3
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance with Breguet hairspring
• Power Reserve: Unknown
• Production Period: 1929+
• Country: France
• Identification: Dial side marked with Geismar logo. Shown in an article from Hans Weil (see external link 2 below).
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link 2: https://hans-weil.faszination-uhrwerk.de/edmont_robert-besancon.pdf