The answer is ref 3940
Why? To quote Mr Stern: this ref 3940 speaks to its wearer about a turning point, not merely in his own life but in the life of his company and his industry, a time when Patek Philippe defied convention and dared to be traditional'.
The 3940 is using the thin 240 movement when everyone said its impossible to do a perpetual calendar but he has proved them all wrong....
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