Basic Information
Name: Omega 661
Manufacturer: Omega
Launch Year: 1961
Caliber Family
19800A/h, fixed stud carrier:
660: 17 jewels
661: 24 jewels
21600A/h, adjustable stud carrier:
662: 17 jewels
663: 24 jewels
Related Calibers
Omega 660, Omega 661, Omega 662, Omega 663
Is COSC certified: No
Technical Details
Lignes Dimensions: 6.83 ‴
Dimensions: 15.4 mm
Height: 4.25 mm
Further Measures: Mounting Diameter (Dm): 15.0 mm
Stem height (T): 1.2 mm
Power Reserve: 45 hours
Frequency: 19,800 vph
Jewels: 24
Lift Angle: 51 degrees
Complications and Specifications
Shape: Round
Shock Protection: Incabloc
Regulator Type: Pinned Regulator (or Index Regulator)
Movement Type: Automatic
Rotor Type: Central Rotor
Escapement Type: Swiss Lever
Control Type: Balance Wheel
Winding Type: Automatic (Self-Winding)
Setting Type: Stem Set
Additional Information
Hand Sizes: 0.90 x 0.50 mm
Hand Count: 2
Country Of Manufacture: Switzerland
Notes: Remarks: 1961-1973
Ratchect wheel beryllium bronze
Different rotor shapes (cf. photos)
Smallest ever industrial manufactured automatic movement, regarding the volume (diameter and height)
Quite efficient use of available space (cf. Omega 662, 663)
Other data: Balance staff: U2991, Stem: W2514, Balance staff Ronda: 5176 (6.75), Stem Ronda: 1201 (7.75), Mainspring: 0.950 x 6.000 x 0.065 x 220.000 mm
Signature:
1-2) 1969: 29997612, Omega Watch Co, Swiss, Adjusted 2 Positions, 24 Jewels; Incabloc
3-5) 1972: 34189675, Omega Watch Co, Swiss, Adjusted 2 Positions, 24 Jewels; Incabloc
