Breguet Reference Numbers

How to read a Breguet reference number

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Understanding Breguet reference numbers is especially important as their watches often do not have a name to identify them.
They usually consist of three groups of characters, but can contain even more, especially in case of "Haute Joaillerie" pieces, as well as watches set with precious stones of different colors.

For example:

Disclaimer: this information is absolutely not official, is given with no warranty, and might be wrong. It simply hints at peculiarities I found out at some point in time.
There are also many exceptions, especially in the case of vintage watches, but also in the current catalog, so it is definitely not to be taken as a hard rule. Thanks for your understanding.


Case model Dial Band
generic model number special features case metal / dial / band material interhorn width special features?
000 0 AA / XX / X X X

Case model

Generic model number (digits 1, 2, 3)

Note that high numbers are not really related to size or complications.

Special features (digit 4)

In case of several codes checking out (i.e. a see-through case-back and a diamond bezel), then there is only one code which is chosen by a predefined order of priority.

CodeMeaningCode priority
0Plain backLowest
1Articulated dial cover (except for pocket watches)?
3Special version ?
5"Open worked" full skeletonized dialHigher than 7
7Transparent case-back (even partial)Low
8Diamonds bezel or cover + diamonds on lugs and sometimes caseHigher than 1 or 7
9Pavé diamond dial + diamond bezel, lugs, caseHighest

Case metal (two letters)

BAYellow gold 750/1000
BBWhite gold 750/1000
BRRose gold 750/1000
PRplatinum 950/1000 and rose gold
PTPlatinum 950/1000
STStainless steel


The first of the two digits is generally the most important one; the second digit is used to denote anything special with the dial (like with the Tourbillon model, where the guilloché dial with code 11 which becomes a code 1B when the regular second's hand is replaced with a capital B).
There are so many combinations (especially in the Reine de Naples line-up) that I cannot write them all down; below are the most common.

00No dial (skeleton)
11, 12, 1E or 15Silver coated gold guillloché
29White enamel
2PRed enamel
2YBlue enamel
32Rose gold guilloché
51Mother of pearl
59Blue mother of pearl
5DMother of pearl and diamonds
5TTahiti mother of pearl
8DMother of pearl and precious stones
AS, EU or USSpecial codes for the Hora Mundi: Asia, Europe of U.S.A.
H2Matte black
G9Blackened gold guilloché
J2Cobalt blue
Z2Black rhodium gold guilloché

Band (3rd group)

This group is omitted in case of a pocket watch.

Band material (digit 1)

3Calf leather
9Crocodile leather
AMetal bracelet in yellow gold
BMetal bracelet in white gol)
RMetal bracelet in rose gold
PMetal bracelet in platinum
SMetal bracelet in stainess steel
TMetal bracelet in titanium

Interhorn width (digit 2)

CodeInterhorn sizeSample diameter of watches
6?30 mm
8?35 mm
9?40x34 mm
V20 mm37, 38, 39, 40 mm
W21 mm39, 40 mm
X?44, 44.5 mm
Y?48 mm
Z (and M)?41, 42, 43, 44, 45 mm

Digit 3: ?

Last digit is indecipherable to me. It is a special code which is different depending on the first two digits. It might be used to indicate strap colors, buckle types and metals, etc. but this is only a supposition.