10 1/2”’ | Hand Wind | Swiss Lever | Direct Sweeping seconds |

Remarks:

• Early specimens with fixed hairspring stud-holder, later ones with mobile hairspring stud-holder
• Same movement with bigger base plate (11 1/2”’): ETA 2391

• Listing ID: 7188
• Manufacturer / Brand: ETA
• Caliber: 2390
• 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: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Right (0 - 120°)
• Shock Protection: Incabloc
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Approx. 48 hours
• Production Period: Unknown, probably around 1957
• Country: Switzerland
• Identification: Movement marked with ETA 2390 under the balance wheel. Original datasheet available from 1960. Listed in the Flume K1 catalog in the part from 1957.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)