As the author of the Gas Pump Identification book, I have tried to answer many questions about pumps (Bowsers as you call them), but it seems that the pumps had different Models numbers down under than we had here in the U.S.
First a picture would surly help, then we would know what pump you are asking about.
Second, to answer your question about which companies used the pump, my answer would be, what companies are in New Zealand? Oil companies did not buy pumps, use them, replace them, then throw them away, these used pumps went to the used pump market, much like a used car, so who knows what company put their name or sign on the pump in the aftermarket. My suggestion, sandblast it, take it back to the way it looked during the mfg. of the pump, then paint it what ever colors you want. Hell,paint it yellow and black for Holloween, no one is going to tell you it is wrong.
You might want to check out this page of my website:
http://petrolianacollectibles.com/gb%201114.htmIt might be one of these.
Jack Sim