These printers use the 12A6735 cartridge:
Lexmark Optra T-520
Lexmark Optra T-520 D
Lexmark Optra T-520 N
Lexmark Optra T-520 N SBE
Lexmark Optra T-520 SBE
Lexmark Optra T-520 VN
Lexmark Optra T-522
Lexmark Optra T-522 N
Lexmark T 520
Lexmark T 520 D
Lexmark T 520 DN
Lexmark T 520 N
Lexmark T 520 N SBE
Lexmark T 520 SBE
Lexmark T 522
Lexmark T 522 DN
Lexmark T 522 N
Lexmark X 520
Lexmark X 520 MFP
Lexmark X 522
Lexmark X 522 MFP
Lexmark X 522 S
Lexmark X 522 S MFP
Burroughs-Unisys UDS 130
Burroughs-Unisys UDS 130 N
Burroughs-Unisys UDS 132
Burroughs-Unisys UDS 132 N
Gestetner P 6220
IBM 4520-001
IBM 4520-002
IBM 4520 D01
IBM 4520 D02
IBM 4520 DN1
IBM 4520 DN2
IBM 4520 N01
IBM 4520 N02
IBM 4525-001
IBM 4525-002
IBM 4525 DN1
IBM 4525 DN2
IBM 4525 N01
IBM 4525 N02
IBM Infoprint 1120
IBM Infoprint 1120 D
IBM Infoprint 1120 DN
IBM Infoprint 1120 M
IBM Infoprint 1120 MI
IBM Infoprint 1120 MIX
IBM Infoprint 1120 MN
IBM Infoprint 1120 N
IBM Infoprint 1125
IBM Infoprint 1125 DN
IBM Infoprint 1125 M
IBM Infoprint 1125 MI
IBM Infoprint 1125 MIX
IBM Infoprint 1125 MN
IBM Infoprint 1125 N
Micro-Plex Rapid 18-3
Micro-Plex Rapid 24-3
Nashuatec P 6220
Nashuatec P 6225
Rosetta RT 1120 M
Rosetta RT 1120 MI
Rosetta RT 1120 MIX
Rosetta RT 1120 MN
Rosetta RT 1125 M
Rosetta RT 1125 MI
Rosetta RT 1125 MIX
Rosetta RT 1125 MN
Source-Technologies ST 1120
Source-Technologies ST 1125