Omega never touched these. Lemania made them100%.
Being the flagship of the SSIH, Omega got the version with the 24h indication.
Lemania and Omega at the time, from 1932 until 1982, was under the same ownership.
All chronograph and other complications movements was made by Lemania within the group. Alarm, moonphase, chronographs. There are no documented exceptions I know of.
Omega did not obtain tooling for chronograph movements until the tools for caliber 86x/186x was moved to Bienne in the mid 1980s.
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