The Order of Australia is a national honours system that was introduced on 15 February 1975, and this year marks the 50th anniversary of its introduction. In celebration of this significant milestone, Australia Post has released a special commemorative stamp (). Figure 1. Special stamp issued by Australia Post celebrating the 50th anniversary of the Australian honours system, featuring the medal and ribbon of the Companion of the Order of Australia. ©Australia Post. Design by Jason Watts.