How to configure the Zebra GK420D printer for printing Royal Mail's 2D barcode labels
Zebra GC420d Direct Thermal Printer (GC42-202510-000) Review | PCMag
Zebra GK420d Printer | Direct Thermal Label Printer | Serial, Parallel & USB Ports
Amazon.com : ZEBRA GK420d Direct Thermal Desktop Printer Print Width of 4 in USB Serial and Parallel Port Connectivity GK42-202510-000 : Label Makers : Office Products