ZZ code on 1969 Camaro Z/28 trim tag

[Mark_C]

I've got an image of an 08A X77D80 trim tag with a trim code of Z715. The font is identical to the rest of them on the tag in size and font, its just an extra character under the 9 in ST69. The TR code (the digits) usually starts one space to the right of the 9. It's a cowl tag from late in the 08A week (probably one of the last of that week), must have been a slow day on the cowl tag machine.