New Zealand "Kiwi" stamps

guyana1230,
 If you check the die cut perforations, you will notice that the corners have a different die cut on each stamp. This could mean they are from different printings or are from different format booklets. We have the same thing here in some of our Canada issues. US issues also have different die cut issues for the same stamp and different printers. Fun to try and get all the various die cuts and printings, but with a little patience and a lot of kiloware, you will eventually get most of them. All these different printings usually end up with color variations as well.

A kiwi in this context is a New Zealander or of New Zealand,  a kiwistamp is like the forever stamps of the USA that keep their value.  The design is a leaf which is the symbol of New Zealand. The symbol comes from the leaf of the New Zealand fern-Cyathea Dealbata (Ponga is the Maori name). The leaves are dark green on the upper side and silver underneath. The underside glows brightly in moonlight providing excellent track markers in New Zealand's native forests.  

khj, stampie78, Thank you both very much, I got my duplicates out and went through them again. I now have 4 from one set and 3 from the other, also checked with the other Kiwi stamp set of 10 and found although I have a set of ten when I have sorted into the 2 different die cuts I now have 8 from each set. Now need to look out for the other 7 to complete all four sets.