I live in NZ. I've never had something that expensive shipped from overseas but probably my best experience has been with Fedex. It took 4 days (including a weekend) to get from Texas to Auckland which I was quite impressed with. It is quite expensive though and I imagine even more so to insure the shipment. I've had a few thing shipped from the US using DHL and I was also really impressed with that but, once again, it is fairly expensive.
If I was getting something that expensive shipped from overseas then I would personally go for a trusted international company like Fedex or DHL even if it costs a bit more.
I currently live in Christchurch, but I'm from the UK originally. Can't say I've never purchased a watch from the UK since being in NZ (4 years)... so I'm not sure what to suggest. It's nice to see that some kiwis are interested in watches though! I hope you find a solution to your problem soon.
I just sent a watch to Singapore from the UK using Royal Mail Airsure. For a 5 day service it cost £13 which is brilliant. The pakage was small though as there was no box but that was it fully insured.
If you have a weight i could maybe get you a quote.
I'd suggest DHL... Fedex can sometimes lose track of where NZ is and take a very long time to deliver. DHL will be a 2-hop by air to either Auckland or Chch then inland delivery by NZ Post, so very efficient.
I think the major problem you (or the seller) will find is that it is nigh on impossible to get insurance from any carrier for that amount from the UK to almost anywhere. Royal Mail/Parcelforce only insure up to £500 and that costs extra. After that you are looking at Fedex as being about the cheapest (that I've found) for their Economy service. I'm pretty sure once again though that they won't offer extra insurance on watches/jewelry.
Of course, if you don't mind it getting shipped uninsured then Royal Mail Airsure or International Signed For are pretty reliable. I've posted lots of watches abroad and never had an issue. Myself though, I wouldn't use them for something that valuable.
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