Greetings Ash.
Ideally I would require a little more information, and I am more familiar with the original surveys of Auckland, South Auckland, and the Waikato.
Look for larger period maps. Do Archives NZ and Papers Past searches, just for the area of interest and locality. Say; Pouhatu West and allotment; OR acres trying to find references, sales adds or maps that will give you the names allocated to the surveyed parcels of land when they were first registered etc. In my area the maps will be overwritten with a Parish name, and then lot numbers. Also overwritten on the maps will be council or regional names.
Confusing when some of the original maps will have the likes of "New Munster" written on them.
What you have is a clipping. There are a number of allotments notated, and probably involving three separate surveys. Each succeeding the previous larger block.
I was starting to add up the acerage [A.R.P.] when I realized that there was a smaller subdivision, off a previous subdivision numbered 1, 2, and 3, at the top, but then below that there is a second 3 [rd] lot (bold numerals) and each of those numbered lots, also have notated their area as A R & P.
So your small clip, is probably part of the original survey, and then the three lower ones are notated with their acerage, and numbered allotment thereof. Above being three smaller lots surveyed off a previous allotment.
I could attach local examples but that would probably confuse you more and not be relevant.
Alan.
PS As we have corresponded in the past PM me if you wish. Looks like Jens is still proving to be a challenge.
Edited - Senior moment re locality,