This seller, who regrettably doesn't seem to have a good camera, has listed three to the complete set of four hard-to-find Dennison nut cups from the late 1920s. These were sold by Dennison only as sets. The one missing has these same black borders on the short ends only with the imagery populated heavily with bats and new moons. Fair market value is $55 each for mint examples like this one.
02/14 Update: Two finished very strongly, at nearly $80 each. The third finished below fair market value at $41.00.