The Zebra GX420t is a widely sold Thermal Transfer printer from Zebra with a 203 dpi print resolution. The GX4 series of Zebra has been followed up by the ZD4 series of Zebra.
Alternatives to a desktop labels printer such as the Zebra GX420T are legion, some examples of Godex are the Godex GE3o0 and the Godex RT700