The chamber on the side of the case houses a blackened steel membrane that expands or contracts according to the aquatic pressure exercised upon it. Its movements are passed on to the pointer-type display indication via an ingenious transmission system that is partially visible through the dial centre. The depth indication ranges from 0 to 80-metre.
Jaeger-LeCoultre Calibre 899
A multi-level dial, Master Compressor Diving Pro Geographic
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Mechanical membrane depth gauge, Master Compressor Diving Pro Geographic
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