From camaros.org
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SPECIAL PAINT DESIGNATION. Special paint cars were identified with a unique paint code on the firewall cowl tag. (In 1968-69, either deletion of a stripe or use of a non-standard stripe color were considered to be special paint.) 1967 special paint cars used the letter "O" instead of the normal color code. In January 1968, the letter "Z" paint code was used to denote the newly available Camaro color called British Green and notation of special order paint was changed to a dash "-". The "-" (dash) special paint code continued for the rest of the 1968 model year as well as for the entire 1969 model year.
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http://www.camaros.org/numbers.shtml...S:SpecialPaint