Got some information on this piece.
I am told that there is an old faded catalgue label on it. Originally collected by a German in the late 19th century and held in Germany. Then bought by an Aus collector and then in the hands of the seller. According to the seller it is most probably Wirragerri collected along the Murry River near the border with the state of Victoria.
It appears there are many ways of spelling "Wirragerri"