Not New Zealand though. It's Cook Islands. Since it's 10 grams of gold if I read carefully, it is at least worth 229USD according to today's exchange rate. And because you have the first serial number, which is often reserved by the mint, that will increase the value quite subsutitantly, but by how much, I am not too sure. Maybe 300USD+ is a reasaonble figure, but don't quote me on that.