'66 U15
Well Mark looks confirmed to be a U15. At first I thought it might me a U13 because of the doors being added from a later model. And then the gate too. You can definitely tell it is an early one (Budd Body most likely) with the eyebrow grill, early hood (multiple struts underneath) and the rain gutter above the driver's side floor pan. So still a good find at that! Also, the vin tag indicates a special ordered dso code. Can't tell what is special other than there are 6 digits to the dso instead of the standard two.