Dan, that decoding is right, apart from the colour. It's silver. And I think always was. I couldn't find any hint of a respray.
The Chassis Number starts with HZ33. This is the number also imprinted into the bulkhead in the engine compartment.
From what I can gather, Japanese VIN numbers are called Model Numbers (as per photo) and are not at all like US style VIN numbers - for which there are several sources on the web, including at 350z forums in the US.
Confused? I was. But it's clearer now. Plus I have now seen the Auction Sheet that was faxed to me - showing consistent info with the logbook and mileage.
Thanks for the tip about HPI - yes, great idea, and I will do that.
I can't post photos of the vehicle yes - haven't got it. I could post the link to the sales site, but I don't want it to appear that I distrust the sellers.
Anyway - it's four years old and has 4,000 miles on the clock. Brake discs need some action to get them shiny again, but it seems in perfect nick.
Shame about the satnav (reading other posts in this forum). Sounds like a choice between replacing what's behind the screen (which is tidiest solution) and getting a double-DIN unit to replace the current CD/radio (the Kenwood has been mentioned). If anyone has done either - and is proud of it - please share! Thanks.
And thanks to all the welcoming posts. It's great to be here. I now have satisfied a childhood dream to have a sports car - at the ripe old age of 5x (where x is a state secret).
Steve