A light colored, presumably white, 1969 Camaro SS 396 convertible was used as the pace car for the Sports Car Club of America's (SCCA) Glen 500 Trans American race held at Watkins Glen International Raceway in Watkins Glen, New York on Sunday, August 10, 1969. Mark Donohue would be victorious in the event in his 1969 Penske Camaro Z28.
This might be the same car that was used as the pace car for the Six Hour Sports Car & Can Am events held the prior month in July but this 1969 Camaro SS 396 convertible is not the same car that is currently for sale as the "1969 Chevrolet Camaro U.S. Formula One Watkins Glen Grand Prix Pace Car." That car was built in September of 1969, one month after the event depicted in these images. (A thread on this car will be posted in the future.)
https://www.flickr.com/photos/thehenryford/albums/72157632997627147