Lexmark
99A1643
is compatible in the following Printer Models:
Lexmark Mono Laser
Optra T610 (4069-010)
Optra T610n (4069-01n)
Optra T612vn (4069-31e)
Optra T612v (4069-31v)
Lexmark T520d (4520-001)
Lexmark T520dn (4520-002)
Lexmark T522 (4520-210)
Lexmark T522dn (4520-220)