This appears to be a professionally printed 10x8 racing publicity photo from Deke Houlgate Enterprises, likely produced on photographic paper in the early 1980s to promote the Pennzoil Chaparral and reference earlier Chaparral models.
Al Unser Ontario CA Chaparral Pennzoil Pit IndyCar 1979 - Himes Estate Photo
Johnny Rutherford Patch #1 Pennzoil Chaparral Racing Jim Hall IndyCar
Panther Racing Decal 2005 Fan Pennzoil Tour IndyCar Indy 500
Pennzoil Jim Hall Al Unser Chaparral Racing Print Ad IndyCar Garage Illustration
Pennzoil - Indy Car - Johnny Rutherford Chaparral Race Car Nose Style Metal Sign
Vintage Racing Decal Lot Indy 500 Pennzoil STP Moroso IndyCar Stickers
