Looking at 1 of 1 67 Formula S

The problem with saying 1 of 1 or 1 of 2.... these cars could be ordered from a list of options. Meaning if you break almost any car down to it's options it could be a 1 of 1 car. It all depends on how many options you want to go through.

1 of 1000 Dodge Dart R/Ts Built
1 of 400 Built with a 440
1 of 200 Built with a 4 speed
1 of 75 That was Painted Purple
1 of 30 That had a Crap Brown Interior
1 of 13 That had head rests
1 or 6 That had a blue dash pad
1 of 1 That had cup holders

*The above is a fictionalized example*