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Fascinating side-shots of the JLC automatic movement cal. 920, which debuted in 1967, built into (from above to below).....

 

- the Audemars Piguet 5402 to become the AP cal. 2121

- the Vacheron Constantin 222 to become the VC cal. 1121

- the Patek Philippe Nautilus 3700 to become the PP cal. 28-255

Cheers, HSTE




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