david,this time youre totally 100% right and I have to agree with you.your experience in stamp is just more than anyone at here currently even more than notrare which has 50 years of experience.beside that,you really helped me alot for providing me usefull information for my stamps.seriously,i really respect and believe in you.thanks for giving the information regarding this stamp(i nearly put it into the bin,luckily u helped me to save it),beside it.i saw some of my australia and great britain stamps with the same tiny perforation holes on horizontal sides too but no less hole at all.here is one of the best example of great britain machin stamps showing on the photo below.what you can see is many tiny holes on top perforation holes and 14 tiny holes on each stamp but unfortunely,i still have no idea what caused missing holes on the new zealand stamp.

