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Patek Philippe

Very right

 

The case does not create the sound, it is just transmitting it, as well as the saphire glas and the aperture for the lever to active the repeater.

It must not be forgotten that such watches are not water- or dust-proof.

F.P. Journe's steel repeater is water-proof, as the manufacturer is saying, but I am not in the position to test it, unfortunatelly.

Also: the wire design for the gong is very much different to the classic circular wires.

Platinum is actually harder than gold, but as 18 k gold is an alloy, and RG contains copper, that is quite hard, it should be the reason why RG has good sound transmission qualities.

The best has steel as it contains chrome and cobalt and especially chrome is very hard.

Regards

Moritz

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