Chris,
AWESOME piece of history there! That is the best cover I've ever seen on a solo polo. As always, you have some really neat stuff.
I have a neat story for you about the Persons Solo Polo seats. One of my friends up here in Cleveland is related to Gordon Cycle and Supply, one of the oldest distributors of bicycle parts in that era. His father was at the New York Bicycle Convention with the business, where the new products were introduced by the manufacturers. He came home with a red solo polo seat and hi-rise handlebars from the show. Gordon Cycle was a rep for Murray at the time, and my friend added the solo polo and bars to his early 60's 26 inch Murray. He told me kids would stop him on the street to check out the seat, it was wildly popular.
I have a picture of him on the bike, I posted it here on The Cabe once, let me see if I can find it to post it here. The picture is really great.
Good stuff Chris!