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Valjoux vs Lemania

 

This from watch-wiki.net:
In the 1940's, Lemania and Omega worked together on a project called "27 CHRO C12" to develop a 27 mm diameter chronograph with a 12-hour register. Lead by Albert Piguet and Jaques Reymond, this project resulted in the 1942 launch of the Lemania 2310, called Calibre 321 by Omega.
The Valjoux 22 and similar Valjoux 71 are chronograph movements produced by Valjoux and later ETA for 60 years, from 1914 through 1974.
So your ref 4178 has the VC calibre 434, which was based on the Valjoux 22. Nothing to do with Lemania.

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