Unknown to many collectors are the Special Offer series that comes from Europe. The Special offer was that double-sided mask would be included with the figure. This promotion only extended for a certain few figures, and for a limited time.
Only three types of mask were offered. A He-Man/ Skeletor mask, a King Hiss mask in both Human / Snake form and finally a Hordak / Stonedar mask. It seems from the way the pictures are set up, that each mask would be specific to the character toy. In other words, King Hiss's mask goes with King Hiss and He-Man/Skeletor mask with He-Man or Skeletor. This is possible, but the mask with this Stonedar piece is a He-Man / Skeletor mask.
The sides of the card say "Now with great mask!" and on the back, topside it says "transforms you into one the leaders of Eternia! "
He-Man with mask:
He-Man with mask:Inside of this Masters package is a cool/great/super double mask. One time you are Heman, the other time Skeletor