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Patek Philippe

That's part of its charm.

 

As others indicated, it is to distinguish the evening/night hours. It was that way on the original first series from '85-'87, along with other distinguishing marks, such as the accent on the 2nd "E" in geneve, bubbles that flanked swiss at the 6:00 position, etc.

Congratulations on acquiring this very nice timepiece.

Aloha,

Bob

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