1978

Ben Cooper

While the copyright date on box says 1977, it's more likely to have been released in 1978.

Consisted of vinyl suit and thin plastic mask. Packaging was in an 8.5" x 11" thin cardboard window box with color artwork and logo.

From StarWars.com:

The first Ben Cooper Boba Fett costume (there were two) holds a special place in the galaxy of Fett collectibles, as it appears to resemble early marketing illustrations for the 1979 Kenner action figure. In fact, the costume itself seems to show a depiction of the action figure, complete with red rocket firing missile in his backpack. This Fett will cost you far less than the action figure, though — these can still be found complete in the box for around $20.