Turns out there was a 64-1/2 original pony, with under 600 miles on it:
My phone's camera's color balance is a bit off,
as this car is more pearl colored than green-gold.
And another, not-so-sweet, pony, called 'Eleanor's Nitemare' (has something to do with the Gone in 60 Seconds movies). No Mustang expert I, I guessed '69. The dealership guy said it was '71. My subsequent crack interweb research would place it as '67. Said to have been acquired through Barrett-Jackson's for $345K. I tried, but could not get close enough to see if it was equipped with Callahan brake pads.
Ordinarily, you probably don't want someone scribbling on your
dash - unless, of course, it's this guy.