According to Google Translate (what a terrific web site!), AD USUM BELGII AUSTR means 'For Use in South Holland.' The Austrian Netherlands, which corresponds roughly to modern day Belgium, started in 1713. Copper coins with AD USUM BELGII AUSTR appear with Maria Theresa, Joseph II, and Leopold II of Austria. The liard denomination was also called the oord.
Catalog values are about equivalent for all dates, as follows:
LIARD (OORD) (22 mm diameter)
worn: $3 US dollars approximate catalog value
average circulated: $12
well preserved: $60
fully uncirculated: $200
2 LIARDS (2 OORDEN) (27 mm diameter)
worn: $4 US dollars approximate catalog value
average circulated: $15
well preserved: $70
fully uncirculated: $250
Read our Terminology page to understand how to interpret these catalog values.