If its a black roof, it is almost sure that its an older '91-'94 NSX. Newer coupes have a black roof too, but those are more rare. There are a few exceptions, one of them is the Zanardi which is a coupe with a color matched roof, and I believe u had the option to factory order a coupe with matching color roofs. In any case, I think most people will agree that if you see an NSX with a black top it will most likely be a '91-'94 NSX Coupe. If it doesn't have a black top it will most likely be a '95+ NSX-T.
[This message has been edited by RyRy210 (edited 07 July 2002).]