Here's an ebay auction of a '69 428 SCJ Mach 1 that shows a deluxe Marti report like the ones available for Fords '67-'73.
http://cgi.ebay.com/ebaymotors/1969-MUST...1QQcmdZViewItem
If you spring for the Deluxe, they will always try to get down to the hallowed "1 of 1" but IMO they stretch a little. I usually stop reading after we've distilled out the engine/trans and interior/exterior color combo. My friend's '67 R-code Fairlane 500XL got down to 3 black/black XL's with 427's and then the final statement became "only one of those cars had tinted glass, THIS IS THAT CAR". This Mach 1 had to go through several more levels to get to the fact that it was the one that had NO OTHER OPTIONS. Kinda funny. Thoughts? (other than the dream that Chevy USA could have kept similar records).