I have a nice rechromed set of license plate frames from Clippinger Chevrolet, the dealership that my car was purchased from on June 20, 1969. At that time, the dealership was in Covina, CA; still in business today, but relocated to West Covina. I hear the original lot is still there today.
Side note, I have both original California black plates (tag # is my username), and have got the exact same plate number reserved here in Australia so when the car eventually hits the road again, it will wear it's original plate number. Wife thinks I'm mad, but to me that's a nice tribute.