1973 Mustang Question

[JoeT]

What is the difference between a 1973 Mach1 or 1973 Sport Roof?

I have the chance to buy a 73 Mustang but there are some issues with the original vin # and so now it was registered since 1988 under Arizona Vin. Not sure I understand that really.

So the vin number the guy gave me doesn't make sense and so I'm trying to determine the difference of the 2 cars. Going to look at it on Monday, figured someone on these forums would know the difference.