So when Cartier, best known for its classic Tank and elegant Ballon Bleu watches, introduced its Calibre de Cartier Diver ($8,200) this year with full compliance with ISO 6425, the watch world took notice. After all, most dive watches scarcely see time underwater anymore, and there is considerable cost involved to have every watch independently tested for certification. Aside from the obvious water resistance requirement (100 meters, by the way), there are more specific guidelines: the ability to read the time from a distance of 9.8 inches in total darkness, a healthy resistance to salty water, magnetism, shock, considerable tugging on the strap, and many other devious and torturous deeds.īut the fact of the matter is, not many watches are even subjected to the testing required to earn the ISO seal of approval.
ISO 6425 is an international standard that spells out in great and unambiguous detail the criteria for what can be called a “diver’s watch”.
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