10 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• In other movement identifiers also referred to as caliber 10 ½”’ or Frey 2. Whether these are separate calibers is unclear
• The caliber B also exists in 9 ¾”’
• There were two different forms of the setting lever spring (see extra picture)

• Listing ID: 4317
• Manufacturer / Brand: Frey / Freco
• Caliber: B
• 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: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Screw balance
• Power Reserve: Unknown
• Production Period: Unknown
• Country: Switzerland
• Identification: Marked "CAL: B" on the wheel train bridge. Listed in the Bestfit Encyclopedia from 1972.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-12#post-2359226