The Pandour's were irregular troops for Austria during the War of
the Austrian Succession
(1740-48) originally formed by Baron von Trenck.
Their exploits, while effective for a time, became notably troublesome when many
of these troops became renegades and the units disbanded with von Trenck
imprisoned (he committed suicide in prison 1749).
Their fearsome reputation became well known throughout Europe in these times
however,
and motif heralding them in a commemorative sense began to appear as
noted, on plug type hunting bayonets around 1750+.
As far as I have known, these motif and inscriptions using the term "VIVAT
PANDUR" & "V. PANDUR"
only occurred on these bayonets and on some court type hunting swords of
later in the 18th century.