... isn't this the one that was Cat C a couple of years ago? Rebuild project was somewhere on the forum, I think?
If Silverstone Auctioneers are right that this was the only IOP manual in 1999, then it must be the same car. Mistyped reg in title, should be: T506CSB
Edit to add link: https://www.silverstoneauctions.com/honda-nsx-6964