Shortly after i bought my 442, i tracked down the original owner- he Told me he ordered the car new at the local oldsmobile dealer in Bellevue. Did a little searching on the internet and found this pic of the dealership in 1969.
The building is still there... last summer I was in that area and snapped a pic of my car out front.
I actually found a license plate holder from the dealership at a swap meet a few years ago. Must be pretty rare since the dealership closed and merged with the Cadillac dealer a few blocks away around 1975 or so.