Starting to sell off some of my Star Wars collection and starting with this one.
Kenner Star Wars 21 back Hammerhead on original card, not tampered with and tightly sealed.
Bubble slightly yellowed but uncrushed and really nice, no cracks from what I can see.
The card has a crease top left corner shown in the photos. 
See photos for all condition details. This was purchased back in the late 90's/early 00's and been in my collection since.