6 3/4 x 8 1/4”’ | Hand Wind | Cylinder | No 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.
• Rocking bar winding
• Click on the dial side
• This movement is typically found in watches with the brandname OISA EXTRA

• Listing ID: 5699
• Manufacturer / Brand: OISA
• Caliber: 6 3/4 x 8 1/4'''
• Size in French Lignes: 6 3/4 x 8 1/4'''
• Size range mm largest diameter: 0 - 22 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Cylinder
• Date, Day, Month...: None
• Jewels: 6
• Setting Lever Screw/Pin Position: Left
• Balance Position: Right (0 - 120°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Brass
• Power Reserve: Unknown
• Production Period: Unknown, maybe around 1940
• Country: Italy
• Identification: Movement marked with O.I.S.A. Not listed in any movement identifier known to me.
• 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-65#post-9129451
• External Link 2: https://watch-movements.eu/blog/en/2019/03/31/domenico_morezzi-2-2/