Lecoultre made some very nice chronjos in pocket watches, at the end of the 19th , early 20th Century.
As for wristwatch Chronos, they used Valjoux or Universal Genève movements ( screw in case back: Valjoux, snap case back: U.G ).
There were some very nice ones, like a sublime and very rare cushion shape I saw some months ago.
This one, I would dream to see it re edited.
I don't have pics of it, but if I see his owner, I will ask him to authorize me to take some pics.
Best,
Nicolas.