Do we have any information on the last day of Mustang production at Dearborn. My 1966 Fastback GT, pony interior, HIPO, Emberglow exterior, Emberglow and parchment pony interior with Washington DC, DSO has a VIN build date of 12V. So, it must have been one of the very last 1966 Fastbacks built optioned like this. Maybe even the last one.