Hubleyman:
That is very interesting! George Olsen was a Cadillac dealership and I do not recall them actually being a Chevrolet dealership as well. Although your paperwork shows a "Chevrolet" sticker, it does not actually indicate on it that the Olsen dealership itself was a "Chevrolet" dealership.
Since they were a Caddy dealer, back then it would not have been a big deal for a GM dealer to obtain a different GM brand car for a customer. Perhaps the original owner was affiliated with Geo. Olsen in some way or just liked working with their dealership.
Thanks for sharing!