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...calculators and compasses, Panerai created a prototype watch able to withstand the extreme conditions naval usage would subject it to. In 1938, the Radiomir, so named for the radium-based substance used to illuminate the dial, went into production exclusively for the Italian navy. It boasted a 47-mm diameter???practical for distinguishing numerals while diving in murky waters. Between that time and 1993, only 300 Panerai watches were made, each one for exclusive use by the Italian or Egyptian navies. In 1993, Panerai offered a limited number of the Radiomir's successor, Luminors?named for their...
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