You are buying stamps which add up to standard 50 cent postage. They are all Australia & Territories postage stamps. All valid for postage in Australia. I am selling my extensive collection over the next few months. All stamps are new, mint, unused, with full gum. This is how they are made up;

57x28 cent +57x 22 cent = $28.50 (28 +22= 50)

143 x 30 cent + 143 x 20 cent  = $71.50  (20 +30 = 50)

So, grab yourself a bargain!!!!