Case material abbreviations
Since the 1970s, the model number of Audemars Piguet watches has been supplemented by an indication of the main material (or materials) of its case.

Code	Material	Code	Material
AA	Green gold	OK	Pink gold / rubber
AC	Yellow gold / white gold	OL	Pink gold / Tantalum
AG	Silver	OM	Pink gold / cermet
AE	Alacrite	OR	Pink gold
AI	Alacrite / Titanium	OS	Forged carbon / steel
AK	Yellow gold / rubber	PA	Platinum / yellow gold
AL	Aluminium	PO	Platinum / ceramic
AP	Yellow gold / platinum	PM	Platinum / cermet
AR	Yellow gold / pink gold	PR	Platinum / pink gold
AU	From 3 materials	PT	Platinum
BA	Yellow gold	RA	Pink gold / yellow gold
BC	White gold	RC	Pink gold / white gold
CA	White gold / yellow gold	RO	Pink gold / ceramic
CB	White ceramic	RP	Pink gold / platinum
CE	Black ceramic	SA	Steel / yellow gold
CK	White gold / rubber	SB	Blue PVD-treated steel
CN	White gold / ceramic	SC	Steel / white gold
CR	White gold / pink gold	SK	Steel / rubber
FC	Carbon fibres	SN	Black PVD-treated steel
FO	Forged carbon / ceramic	SO	Steel / carbon
FR	Carbon / pink gold	SP	Steel / platinum
FS	Carbon / steel	SR	Steel / pink gold
IA	Titanium / yellow gold	ST	Steel
IB	Titanium / blue PVD-treated steel	TA	Tantalum / yellow gold
IC	Titanium / white gold	TI	Titanium
IK	Titanium / rubber	TK	Tantalum / rubber
IO	Titanium / ceramic	TL	Tantalum
IM	Titanium / cermet	TP	Tantalum / platinum
IP	Titanium / platinum	TR	Tantalum / pink gold
IR	Titanium / pink gold	TS	Steel / tantalum
IS	Titanium / steel	TT	Tantalum / steel
LT	Brass	ZI	White diamond / blue sapphire setting
OI	Pink gold / Titanium	ZO	White diamond / onyx setting
OF	Pink gold / forged carbon

Related content