Well, the good news is that this is an unusual card of an unusual place.  Issued by Australia Post in 2013 with pre-printed worldwide postage on the reverse, properly cancelled, the “Maximum Card” element on the front was unfortunately targeted by Hongkong Post also.  Australia’s special first day of issue postmark is still clear.  Very hard to know what the right grade should be–not 1, not 5, so we’ll say Grade: 3