I collect Sinclair's Hard Cardboard Signs and their Posters. I really like the 28"x43" posters but I will purchase any size that I don't already have.
The Hard Cardboard Signs were either the large 48"x72" type used under the main Sinclair Roadside signs or the smaller, 24"x30" size used on the pump islands.
Let me know what you would like to sell and hopefully we can agree on a purchase price.