These printers use the 12A6730 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

Micro-Plex Rapid 18-3

Micro-Plex Rapid 24-3

Nashuatec P 6220

Nashuatec P 6225