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There are two main types of HP80. The front label on the earliest versions just says "Hewlett Packard". This version is actually rarer than the HP35 red dot. Genuine ones will have a serial number in the 10000-13000 range. Later versions add the "80" to the front label.
You can also find a couple of minor variations in the lettering around the on/off switch. On some it is painted on the keyboard. Others have raised lettering molded in the case. Some have raised lettering that is painted white.
Finally, later production units have painted silver trim above the switch... the earlier ones have a metal trim bar.