8 3/4 x 11”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Backwinder (winding on the back of the watch)
• Special case design in which the crown with winding stem and pinions for winding and hand setting remain in the case back

• Listing ID: 352
• Manufacturer / Brand: Wyler
• Caliber: 8 3/4 x 11'''
• Size: 8 3/4 x 11'''
• Shape: Form
• Winding: Manual (Crown)
• Hand Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date & Day: None
• Jewels: 17
• Setting Lever Screw/Pin Position: None (Backwinder)
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Around 1930
• Identification: Shown in the Paulson 1950 in the automatic version. The automatic version is described in Wyler's Swiss patent CH158881 from 1932.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-59#post-8314356
• Country: Switzerland
• Contributor ©: Uhrforum.de member Goldstadtjung