This system is a marked improvement on the traditional screw-locked crown in three different ways. Firstly, the system is housed inside the case, sheltered from sand, dust and damp. Secondly, by remaining independent from the winding-stem, the compression key system preserves the movement from repeated strain linked to its operation.
Maximum functionality and readability, Master Compressor Diving GMT
Operating indicator, Master Compressor Diving GMT Lady
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Patented compression keys, Master Compressor Diving GMT
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