why is it something special ?
Oil can collectors each have their own specialties, but just about every collector looks for good graphics. A can graphic that has an appealing picture as the Minuteman sets it apart as special. If there are not many around to supply the people who would like to have one, the value goes up. Condition is always a big factor. Your can looks like it will clean up some, but some spots will not go away.
Good luck in the sale of your can.