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What Do the Letters Stand for in Patek Philippe Reference Numbers?

April 8, 2019

BY Paul Altieri

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Have you ever noticed that Patek Philippe reference numbers and caliber numbers also include letters? If you’re not sure what the letters in these alphanumeric codes mean, read our handy guide to deciphering the letters in Patek Philippe reference and caliber numbers to find out more.

Patek Philippe reference numbers

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Brush Up On Your French To Understand Patek Parlance

Patek Philippe is based in Geneva, which is in the French-speaking part of Switzerland. As such, the letters in Patek Philippe reference numbers and movement codes are abbreviations of French words (the same goes for Rolex).

The letters in Patek Philippe reference numbers signify the case material of the watch.  

J

  • French Word: Jaune
  • English Translation: Yellow
  • Case Material: Yellow gold

G

  • French Word: Gris
  • English Translation: Gray
  • Case Material: White gold

R

  • French Word: Rose
  • English Translation: Pink
  • Case Material: Pink gold

A

  • French Word: Acier
  • English Translation: Steel
  • Case Material: Stainless steel

P

  • French Word: Platine
  • English Translation: Platinum
  • Case Material: Platinum

T

  • French Word: Titane
  • English Translation: Titanium
  • Case Material: Titanium

Patek Philippe reference numbers

On the other hand, the letters in Patek Philippe caliber numbers signify the complications and functions of the movement.

10J

  • French Word(s): 10 jours
  • Complication/Function (in English): 10-day power reserve

24H

  • French Word(s): 24 heures
  • Complication/Function (in English): 24-hour dial

AL

  • French Word(s): Alarme
  • Complication/Function (in English): Alarm

C

  • French Word(s): Calendrier
  • Complication/Function (in English): Date indicator

CH

  • French Word(s): Chronographe
  • Complication/Function (in English): Chronograph

CHR

  • French Word(s): Chronographe à rattrapante
  • Complication/Function (in English): Split seconds chronograph

CL

  • French Word(s): Ciel
  • Complication/Function (in English): Sky Chart

EQ

  • French Word(s): Equation du temps
  • Complication/Function (in English): Equation of time

FUS

  • French Word(s): Fuseau horaire
  • Complication/Function (in English): Dual time zone

HG

  • French Word(s): Heure à guichet
  • Complication/Function (in English): Hour shown via an aperture

HS

  • French Word(s): Heure sautante
  • Complication/Function (in English): Jumping hours

HU

  • French Word(s): Heure universelle
  • Complication/Function (in English): World time

IRM

  • French Word(s): Indicateur de Réserve de Marche
  • Complication/Function (in English): Power reserve indicator

J

  • French Word(s): Jour
  • Complication/Function (in English): Day indicator

LU

  • French Word(s): Phases de lune
  • Complication/Function (in English): Moon phases

PS

  • French Word(s): Petite seconde
  • Complication/Function (in English): Small seconds

Q

  • French Word(s): Quantième perpétuel
  • Complication/Function (in English): Perpetual calendar

QA

  • French Word(s): Quantième annuel
  • Complication/Function (in English): Annual calendar

QR

  • French Word(s): Quantième perpétuel rétrograde
  • Complication/Function (in English): Perpetual calendar with retrograde date hand

R

  • French Word(s): Répétition minutes
  • Complication/Function (in English): Minute repeater

REG

  • French Word(s): Affichage de Type Régulateur
  • Complication/Function (in English): Regulator-style display

S

  • French Word(s): Seconde au centre
  • Complication/Function (in English): Center sweep second hand

SE

  • French Word(s): Semaine
  • Complication/Function (in English): Week indicator

SQU

  • French Word(s): Squelette
  • Complication/Function (in English): Skeleton

SID

  • French Word(s): Heure sidérale
  • Complication/Function (in English): Sidereal time

TO

  • French Word(s): Tourbillon
  • Complication/Function (in English): Tourbillon

Patek Philippe reference numbers

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