Ultra rare M-Code!. Only 640 M-Codes were originally manufactured and only 100 have been accounted for. All numbers matching.
Only 127 4 speed 440 SixPack cars were produced in 1971. 1 of 1 with options for 440 SixPack and 4-speed transmission. Original factory build sheet. Inspected and documented by Galen Govier. Notarized documentation of previous owners.