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The Vintage JLC Triple Calendars.
With or without moonphase, the Triple date, made between the mid 40ies to the Mid Fifties, is certainly to be classified among the most beautiful Vintage JLCs.
Better than beautiful, I would say " refined ".
Let's focus here on the Triple Date.
An extract from the JLC catalog, circa 1947:
Two references were produced, the 2721 and the 2723.
The difference between the two references is mainly about the size, the 2721 case being 35 mm big, while the 2723 is 3 mm smaller.