Nighthawk,
Each is individually numbered. However, they are not really a PNC. They are a Medallion. Australian Post has release a number of these medallions. Some are very impressive. I bought 2 of these, Nos 299 and 300.
Watch out for ebay. I am advised that there are sellers listing them as 'sold out'. I don't believe they are. If you do decide you want one and if Humpy can't get you one, I can try in my neck of the woods.