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The choice of BB will depend on the crankset.
This bottom bracket is likely 40+ years old though, if it hasn’t come undone yet it probably isn’t going to anytime soon. They don’t easily come undone at the best of time. Old bottom brackets are usually a nightmare to get off.
The most problematic part of French bottom brackets used to be that you couldn’t buy new ones to replace broken ones.
If it’s not broken it really would be best and easiest to leave it alone.
Dogtemple
Which model please https://www.necoparts.com/en/category/Bicycle-Bottom-Brackets/A02.html?