Audemars Piguet Quantième Perpetuel, 25657BA, Yellow Gold

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First launched in 1978, the Quantième Perpetuel by Audemars Piguet was the world’s thinnest automatic perpetual calendar. This example captures much of the appeal of the earliest pieces, with its classic "Audemars Piguet" signature, crisp white dial and traditional yellow gold case. 

Further Reading

The Birth of Ultra-Thin, Automatic Perpetual Calendars
September 2021 16 min read
A Collector's Guide To The Audemars Piguet Royal Oak Ref. 14790
September 2020 33 min read
Buyers' Remorse: Four Collectors, Four Auction Lots They Missed
October 2020 13 min read