Explore the rare Patek Philippe ref. 542 HU World Time wristwatch with exclusive examples, in-depth features, and historical significance. | Patek Philippe

Overview of the World Time ref. 542

The ref. 542 HU (“Heures Universelles” - Universal Hours) is one of Patek Philippe's earliest World Time wristwatch references.

It is also one of the most singular and rare, with only 4 examples believed to exist.

The very first one has recently been unearthed by Edoardo Bolla.

So, now that the 4 examples are known, time has come to dedicate a proper thread to this reference, which I have previously reviewed inside a thread dedicated to Finnish independent watchmaker Reima Koivukoski's “Wanderer”, which is a tribute to the ref. 542.

PATEK PHILIPPE REF. 542

All four examples share 27.1 x 7.8 x 35.3 mm cases made by Wenger with so-called “brancard lugs” and a 10''' HU rhodium-plated caliber.

According to @minutesdevoyages, who studied this reference in depth and to whom this thread owes a great deal (check his post here), the four examples “can be seen as two different batches” of two watches each:

The first batch includes the two watches with movements nos. 818'180 and 818'200, which are clearly mentioned in Louis Cottier's archives: both feature a smooth bezel with 30 city names in French (except "London" & "California" on no. 818'200) & a single-tone 24h ring.

The second batch includes the two watches with movements nos. 821'239 and 823'542: both feature a notched bezel with 31 city names in English & a two-tone 24h ring.

Let's have a look at each of them one by one.

1/ Movement n° 818'180

This example from 1937, featuring “globe” or “lunar” gold hands (also called “fancy” hands) and a long signature dial was previously only known through the page 244 of the book by Martin Huber & Alan Banbery, Patek Philippe Genève Wristwatches (photos are from my own copy of the book).

Bezel featuring 30 cities with ‘Rome’ above ‘Berlin’.

But, very recently, it was discovered, clearly identified by its movement number (818'180) and posted by Edoardo Bolla, aka @tasti_tondi (check his post here), and his brother @mr.a (post here).

And, as you can see, the dial has unfortunately been heavily restored:

The long signature has been replaced by a short signature (no “& Co.”).

The single-tone 24h ring has become a two-tone 24h ring.

The Roman number VI has been reversed or “flipped”.

credit: @tasti_tondi & @mr.a

2/ Movement n° 818’200 & case n° 295’194

This yellow gold example, made in 1928 and sold on 7 October 1938, is now on display at the Patek Philippe Museum (Inv. P-1170).

Its dial, which features “spade” gold hands & a short signature, has also been “heavily” restored, unfortunately.

Bezel featuring 31 cities with ‘Rome’ above ‘Berlin’.

And, of course, why the city names, which are mainly in French include “London” (instead of “Londres”) and “California” (instead of “Californie”) remains a complete mystery!

Lot 608 at Antiquorum Important Watches, Wristwatches and Clocks, Geneva, Hotel Des Bergues, Oct 15, 1994

Lot 122 at Antiquorum 100 Years of Wristwatches, Geneva, Hotel Des Bergues, Nov 19, 2000

credit: @tellewellyn (1), @minutesdevoyages (2), personal photos (3-6) & Antiquorum (last image)

Below, side by side: Ref. 515 HU (left) - Ref. 1415/1 HU (centre) - Ref. 542 (right)

credit: watch pro

3/ Movement n° 821’239 & case n° 618’276

This example in yellow gold, circa 1931, sold on November 25th, 1938, features a long signature dial.

Bezel featuring 31 cities with ‘Cape Town’ below ‘Berlin’.

Lot number unknown at Sotheby’s, New York, in 1989

Lot 193 at Antiquorum Important Collectors, Geneva, Hotel Des Bergues, Oct 20, 1991 (the watch is listed as “pink gold”)

Lot 431 at Antiquorum Important Watches, Wristwatches and Clocks, Geneva, Hotel Des Bergues, Oct 17, 1993 (the watch is listed as “pink gold”)

Lot 248 at Christie's Important Watches and Wristwatches, Geneva, May 18, 1998

Lot 2239 at Christie's The John Shaw Patek Philippe Collection, Hong Kong, November 26th, 2025

NB :

In 1991 and 1993, the watch was sold with “bâton” blued steel hands (I didn't find images from the sales of 1989 and 1998)

In 2025, it was sold with “globe” or “lunar” hands

See images below.

credit: Antiquorum

credit: @jubileewtach

credit: Christie’s

4/ Movement n° 823'542 & case n° 618'277

This example in yellow gold, manufactured in 1938 and sold on 25 November 1938, features “globe” or “lunar” gold hands (also called "fancy" hands) & long signature dial.

Bezel featuring 31 cities with ‘Cape Town’ below ‘Berlin’.

The dial of this example appears to have undergone a fairly significant change in color.

Lot 500 at Antiquorum Important Watches, Wristwatches and Clocks, Geneva, Hotel Des Bergues, Apr 10, 1994

Lot 22 at Antiquorum Exceptional Horological Works of Art, Geneva, Oct 19, 2002

Lot 3103 at Christies Important Watches 28 November 2012