Historical Perspectives: Audemars Piguet And The Ultra Thin Automatic Tourbillon Caliber 2870 (AKA The Thinnest Self-Winding Tourbillon Ever)
There are, let’s face it, not a whole lot of real firsts in watchmaking, which isn’t surprising when you think about its history. The lever escapement, which is found  in basically every modern watch in one form or another, blew into town in 1750; the minute repeater had basically taken on its current form by the end of the 18th century; the first perpetual calendar watch is probably one made by Thomas Mudge, in 1764.  The history of watchmaking is very much a history of small, hard-won incremental improvements that unfolded over a very long period of time, which is why watches like Audemars Piguet’s caliber 2870 automatic tourbillon – less well known for its reference number, 25643, than for the name of the movement, for reasons we’ll see shortly –  continue to be interesting, and continue to be stories worth telling. The other reason (besides intrinsic interest) that the caliber 2870 is worth remembering is because it’s one of

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