The ad is gone, but I think (?) George bought it and IIRC, it was #'s matching. Of course there are other ways to document these cars - #'s matching, Itemized Dealer Invoice, IBM card, GM Canada, POP (I think for '70?), and with probably 99.5% or better accuracy, the original Wholesale Car Order Form or on an SCO car, even the price quote to the Dealer from the Zone office, plus in some cases considerable circumstantial evidence (e.g. original shifter hump). I'm sure I'm forgetting something here too. As an aside, interesting that it's missing the "week" on the trim tag. I have a '70 Flint car that I also believe has a mistake on the tag - "Z" after the Trim Code, but it's a recommended color combo.