Need opinions - vintage Longines

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This watch looks to be a little bit of this and a little bit of that. It would be
interesting to hear what Longines Heritage dept has to say about it😀

Do you find the number 399 on the case somewhere? Or just caseback.
 
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Favre Leuba crown.
Case back from a different watch (possibly the entire case from a different watch). Possibly Favre Leuba as well.
I think the hands have been replaced at a latter date.
Dial and movement are 1940s (mid to late 1940s judging from the serial number).
I guess this falls under the franken watch category.