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Jaeger-LeCoultre

With you there…

 

It’s a level for which nowadays a screw down crown is unnecessary but often used due to laziness. At least the compressor crowns didn’t require the fiddliness of having to unscrew the crowns for winding or adjustment. 


One could add a significantly higher level of WR but then hardly anyone would actually benefit from that 🤷🏻‍♂️

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