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After reading Stephanie’s Longines book and seeing in person the oldest Longines watch the museum has in it’s collection, I started doing a little research on my own.
I was curious about the unfamiliar caliber designation of this watch in the museum that is also on the cover of the new book, Caliber “AA4”. If you do a quick search, almost nothing correct shows up. If you also search for the first Longines movement ever created, the results is the caliber 20A…
