63C means the deluxe interior. It has nothing to do with the Mach I except the Mach I had the deluxe interior as standard.
I believe the second best way to identify a 69 Mach I is the exterior colour code. A colour code plus "5" means the car had a blackout hood. The blackout hood was standard on the Mach I.
The best way to identify a 69 Mach I is the Marti report.
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