Most 5711s you'll see use the caliber 324SC. But take
link another look at that press release from 2006: In it, Patek says that the new 5711 is powered by the caliber 315SC. It's thought that Patek was getting rid of these 315SC movements (used in
link the
montre couleur or homme previous white gold 3711G). The caliber 315 can be found in examples from 2006 through early 2007. Given the short production, these First Series examples are seen less often.
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