OMEGA cal: 480 - 485
Versions: 1955 - 1969
- 480 screw balance, Kif-Duofix for escape wheel.
- 481: screw balance, Kif-Duofix for escape wheel.
- 482: flat balance ring, Kif-Duofix for escape wheel.
- 483: flat balance ring.
- 484: flat balance ring, major redesign.
- 485: flat balance ring, adjustable stud carrier, 21.600 A/h.