Classicwatch Vintage Watches

Hi.
Looking at the Guide for Collector to find infos about my day/date uniplan watch, il read that caliber was 412.
Mine has a balance bridge as caliber 424 or 437.
Is it a franken warch ?.
Any idea ?.
Thanks in advance.

Oupsss.
Here is the warch itself.

You can never say never with the Swiss, but 424 normally has no date function.
I can't say I've seen that case either!

Thanks
For info, this specific case has been made for Hermes. I saw one some years ago in a watch sale but no image for the movement. Mystery remains !!!.
I will bring i to Jaeger Lecoultre mid january and perhaps i will know the thruth and will keep you informed.
Best regards.