Eyes and Ears image courtesy of George Taylor at Imaginerding. Used with permission.
The piece reads, "To make the event even more sparkling, the Captain's Tower will be decked out as a diamond mine." The Captain's Tower was a free-standing hexagonal store (where Disney Pin Traders is today) with a tower above that served as focal point of the shopping district.
Bonus pic of the Captain's Tower on a postcard from a decade earlier in 1977...
On the back of the postcard, it's pretty funny what the original owner wrote to his folks back home about WDW: "This is your kind of place. Except for some high class idiots, this place is alright..."
Postcard via The Postcard Dude.