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Jaeger-LeCoultre

Current production I don't know, but the vintage Polaris case was outsourced

 

In the case of the vintage polaris E859, the case was outsourced (to EPSA), the dial too (to Singer), as well as the hands
So, only the movement was in-house.
But at that time, this was quite the norm in the industry  (and nobody really cared about the concept of 'manufacture' anyhow)
I suspect the modern re-creation of the watch has its case elements in-house now  (but this is to be confirmed)

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