Patek Philippe 5123 Caliber 215 PS Guide
Reference Guide

Patek Philippe 5123 Caliber 215 PS Guide

By quattro · Apr 22, 2025 · 23 replies
quattro
WPS member · Patek Philippe forum
23 replies4563 views54 photos
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In this insightful article, quattro makes a compelling case for the Patek Philippe Calatrava ref. 5123, a reference often overlooked despite its unique design and horological significance. He argues that the 5123 masterfully integrates the smaller caliber 215 PS into a 38mm case, transforming a perceived technical limitation into a distinctive aesthetic strength. This piece encourages collectors to reconsider the 5123's 'disco volante' design and its connection to Patek Philippe's rich heritage.

The release of the new Calatrava ref. 6196P got me thinking (a thread dedicated to this reference can be found here). 

It uses the 30-255 PS caliber which was introduced in 2021 with the ref. 6119. With its diameter of 31 mm, this caliber is much better suited to cases of 37-38 mm than the previous caliber 215 PS, which is only 21.9 mm large.


(credit: hodinkee)


However, I happen to like the design/architecture of the 215 PS much more than the one of the 30-255 PS: I find it both more faithful to traditional watchmaking and more pleasing to look at (just my personal taste, of course).

And it reminded me that, in 2012, Patek Philippe had made what I consider to be a very interesting attempt to use and even display the caliber 215 PS in a 38 mm case: the very much overlooked Calatrava ref. 5123 has indeed a case which is way too large for this small caliber, but its "disco volante" inspired design makes a strength (or at least an interesting element, imo) of what is, objectively, a weakness.

This design includes a very unusual and surprising 17 mm lug-width, which emphasises the "disco volante" look of the watch, a very round shape which is probably not to everybody's taste, but which I personally like.

Let's have a look (case dimensions: 38 x 8.3 x 39 mm) !


Ref. 5123R-001 (a dedicated review of this model from 2012 by foversta can be found here)










































credit: @thehairywrist (1), @operawatches_zurich (2), @atri.vn (3), JC@toffeesthings (4-7), italy zuola int. fashion limited (8-9), the 1916 company (10-14), l’ora del Gallo (15) & ocrolexguy on rolexforums (16-21)


The "disco volantedesign of the ref. 5123, hiding the lugs beneath the case, finds some of its roots in at least four older models from the 1950s and 1960s: ref. 2501, 2572, 2573 & 2591:


a/ Ref. 2501, with a 34 mm case & powered by cal. 10-200 (to which I dedicated a separate thread)






credit: Paul Duggan fine watches 


b/ Ref. 2572 with a 36 mm case & powered by cal. 10-200










credit: pascal karp


c/ Ref. 2573 with a 33 mm case & powered by cal. 10-200









credit: warren's watches (1), atelier tempus (2-4) & loupe this (5)


d/ Ref. 2591 with a 34 mm LUG-LESS case & powered by cal. 23-300 without small seconds






credit: wind vintage (1-2) & coinwatcco (3)


As a conclusion, let me just add this interview with Philippe Stern by Jean-Philippe Arm, where Patek Philippe's honorary President explains the conception of the ref. 5123. This interview comes from the Patek Philippe Magazine, volume III, nΒ° 8, and was kindly pointed out and forwarded to me by bruckner4.




credit: Patek Philippe Magazine, volume III, nΒ° 8


Thanks for reading!

Best, Emmanuel


Review of the ref. 5123 by Tim Mosso

About the Patek Philippe Calatrava Ref. 2501

The Patek Philippe Reference 2501 is a vintage timepiece that represents a period of design evolution for the brand. This reference is recognized for its classic proportions and understated aesthetic, aligning with the brand's enduring commitment to traditional watchmaking. It stands as an example of Patek Philippe's mid-century production, offering a glimpse into the design language prevalent before the widespread adoption of more complex complications in standard production models. The 2501 is a testament to the brand's foundational principles of horological craftsmanship and refined presentation.

This particular reference features a case crafted from 18k white gold, measuring 38mm in diameter. The watch is powered by an automatic movement, with a power reserve of 42 hours. A sapphire crystal protects the silver dial, which typically presents a clean and legible display. The construction includes a fixed bezel and a water resistance rating of 30 meters, suitable for everyday wear but not for immersion.

For collectors, the Reference 2501 appeals to those who appreciate Patek Philippe's historical output and the purity of its design. It represents a segment of the brand's catalog that prioritizes fundamental horological principles over elaborate features. The presence of a date complication adds a practical element to its classic form. Variants of this reference might exist with subtle differences in dial furniture or case finishing, which are often points of interest for dedicated enthusiasts.

Specifications

Caliber
Boucheron 2501
Case
18k white gold
Diameter
38mm
Dial
Silver
Water Resist.
30m
Crystal
Sapphire

Key Points from the Discussion

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The Discussion
GL
GLau
Apr 22, 2025

Hopefully Patek could take notice of your suggestions. Perhaps you should apply for a job there !

AR
Arronax
Apr 22, 2025

Strongly reminds me of the JLC MUT, especially with the see through caseback.

QU
quattro
Apr 22, 2025

It's also close to some models highlighted in this thread . Cheers, Emmanuel Jaeger-LeCoultre Master Ultra Thin - Ref. 145.8.79 S (credit: ColoradoWatches)

QU
quattro
Apr 22, 2025

to work for this Maison, but I don't think they need me, unfortunately! ;-) Cheers, Emmanuel

KM
KMII
Apr 22, 2025

Such a cool shape πŸ™ŒπŸ» Thanks for another informative post πŸ‘πŸ»πŸ‘πŸ»πŸ‘πŸ»

WA
watch-guy.com
Apr 22, 2025

Alas I had a ref 2591 ( I used to call it legless rather than lug lees) Sold many years ago Julian

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