Not that often seen, I am assuming the location is shown at bottom of CDS, Possibly STAWELL
Seen on King George V Sideface. Unknown Location.
Western Australia had Boxed, or Oval "Money Order Office" strikes.
Also CDS (Circular Date Stamps) with "MOO" Money Order Office.
I am not conversant with that stamp, wonder what that ring is, betwixt JA and 29
offerings Victoria 1917 and 1923