Craner,
Thank you for posting the information on your license plates. Yours is the first that we have been able to confirm. According to my current records there were 22 cars delivered to Hertz in Washington State in four separate shipments.
Your car was one of five cars recorded as being delivered on 04/07/66. Since the plate were usually assigned in groups, therefore I believe we can narrow down the car in the picture to be one of the following:
6S1609, 6S1621, 6S1622 or 6S1639.
If anyone has information regarding the above VINs, please let me know.
I am continuing to search for and archive this information and would appreciate any information regarding first issue plates for all states for 1963 through 1970 Shelby production.
Thanks,
Dennis