The commemorative stamps of Australia

The commemorative stamps are distinct from the usual issue,not only because of their design,but also for the fact that,being in tended to celebrate a special occasion,they are on issue for only limited period. consequently their number are considerably less than the normal definitive issue.nevertheless,despite this the lower values even of the earlier issues have never become rare,either in unused or used condition and have remained relatively static in value.some of higher value however have steadily climbed in value over the years as usual errors and varietis of certain types are extremely rare