The VJ-1604 printhead has a native resolution of 1440dpi, 8 nozzle lines. The typical firing frequency for this print head is 8 kHz, utoh part number for this print head is DF-49684.
Markem Imaje Model:X60 (53mm) - 300DPI Market Part Number:ENM10069724 Kyocera Part Number:KCE-53-12PAR1-MKMF Spare parts for SmartDate X-series 53mm thermal transfer printers