Uhm.... manuals were 4 speeds back then.
Also, there is zero chance this car has been 15,000kms... let's forget for a moment they're all in miles not kms... but the odometer is also only 5 digits.
My 68 Mustang is at 6,500kms right now
It's a nice enough example, but it's far from a pristine collector car. Lots of things have been fugged with on it.