Episode 81: The Patek Philippe ‘Pure’ Perpetual Calendar (Beginnings until 3940)
Hairspring25 Nov 2025

Episode 81: The Patek Philippe ‘Pure’ Perpetual Calendar (Beginnings until 3940)

A monumental occasion, this episode covers a complete chronology of the Patek Philippe ‘pure’ perpetual calendar. Arguably, the QP was the complication that built the Patek Philippe name more than any other through the mid-century. Yet, the main bloodline of QP has many nuances that aren’t often covered. This episode highlights all the main references you might expect and their significant points such as 1526, 2497/2438, 3448, and 3450. But if you’ve ever wondered about the 96 QP, 1527, 1591, 3449, or any of the oddball piece uniques, they’re all in here too. We couldn’t wait for leap year to release this, hopefully you’ll forgive us. 3940 and on will be in an upcoming part two.


Links Mentioned:


Thomas Mudge Perpetual Calendar:


https://www.sothebys.com/en/auctions/ecatalogue/2016/john-harrison-enduring-discovery-l16055/lot.28.html


97975:


https://revolutionwatch.com/1925-patek-97975-the-worlds-first-perpetual-calendar-wristwatch/


96 QP:


https://catalog.antiquorum.swiss/en/lots/patek-philippe-ref-ref-96-lot-31-79


Imperial 96 Calendar:


https://www.hodinkee.com/articles/a-rare-complicated-patek-calatrava-you-might-not-have-known-about-is-coming-up-for-auction


1526:


https://hairspring.com/blogs/finds/casa-masson-dial-1526-patek-philippe-perpetual-calendar-pink-gold


Coca Cola Watch:


https://www.hodinkee.com/articles/the-patek-philippe-owned-by-the-founder-of-coca-cola-and-other-ultra-cool-pateks-now-on-exhibit-at-t


Briggs Cunningham Steel:


https://www.christies.com/en/lot/lot-5065258


Magnifying Glass:


https://hairspring.com/blogs/finds/casa-masson-dial-1526-patek-philippe-perpetual-calendar-pink-gold


Casemaker Keys:


https://collectability.com/learn/the-key-to-master-case-makers-for-patek-philippe/


1527:


https://www.christies.com/en/lot/lot-5309213


https://www.ablogtowatch.com/wp-content/uploads/2013/12/Patek-Philippe-Rare-1527-Perpetual-Calendar-18k-Rose-Gold.jpg


1591:


https://le-monde-edmond.com/patek-1591-first-waterproof-perpetual-calendar/


https://www.christies.com/lot/lot-patek-philippe-an-extremely-important-and-unique-4982796/?


2497 & 2438:


https://www.hodinkee.com/articles/in-depth-patek-philippe-reference-2497-part-1


https://www.hodinkee.com/articles/in-depth-patek-philippe-reference-2497-part-2


2438:


https://www.phillips.com/detail/patek-philippe/91327


3449:


https://www.christies.com/en/lot/lot-5493418


3448:


https://revolutionwatch.com/padellone-patek-philippes-most-elegant-perpetual-calendar-the-3448/


Senza Luna:


https://www.hodinkee.com/articles/patek-philippe-reference-3448-senza-luna-in-depth


Unique 3448:


https://www.sothebys.com/en/auctions/ecatalogue/2008/important-watches-ge0804/lot.214.html


3450:


https://www.phillips.com/detail/patek-philippe/180883


Only Watch:


570G:


https://hairspring.com/products/570g-calatrava-white-gold


565 Crown:


https://www.phillips.com/detail/patek-philippe/213980


2526:


https://hairspring.com/blogs/finds/first-series-2526-patek-philippe-calatrava


5040:


https://hairspring.com/blogs/finds/5040p-patek-philippe-perpetual-calendar

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