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

Remarks:

• OISA / O.I.S.A. = Orologeria Italiana Società Azionaria, founded in 1937 by Domenico Morezzi. Morezzi produced his own movements and complete watches. Xaros was one of his watch brands
• Rocking bar winding
• Ratchet wheel and click on the dial side

• Listing ID: 2469
• Manufacturer / Brand: OISA
• Caliber: OISA 51 = OISA Xaros
• 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: Pin Lever
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Nickel with pseudo screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1950
• Country: Italy
• Identification: Dial side marked with OISA 51. Listed in the Flume K2 catalog of 1962, but without illustration.
• 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-36#post-4599906
• External Link 2: https://watch-movements.eu/blog/en/2019/03/31/domenico_morezzi-2-2/