Omega 23.4SC

Omega's first movement with center second, introduced in 1936 and replaced the cal 23.7 from 1918. The cal 23.4 was a great success with a total production of 120.100 pcs. Production ended in 1959.

The pictured movement with number 8.900 000 is not for sale, just information.

Technical data Omega cal: 23.4SC (220).

• 15 jewels, manual wind, sweep second.
• S: = 23.40 mm
• H: = 3.75 mm.
• N: = 18.000 A/h.
• Power reserve: 43 h.
• Mainspring: 1.40 x 9 - 0.95 - 310 mm.

Versions:

• 23.4:         15/17 jewels, sub second, 1936
• 23.4SC:     15 jewels, sweep second, 1937
• 23.4T1:     15 jewels, minor mod. 1941
• 23.4T2:      = cal: 220 after 1949
• 23.4T1SC:  = cal: 230 after 1949
• 231:          15 jewels, sweep second, antimagnetic, 1951