Who knows this never seen 1946 Zenith?

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Good evening, guys,
Who can give me details about this pretty strange (at least for me) Zenith watch. I bought it immediately when I saw it, but I can't find anything anywhere about it. From the movement serial number it looks like it has been made in 1946. Someone understands which caliber is? Here enclosed some photographs.
Please let me know your thoughts.
Thank you!