This Icons Authentic Replicas Miniature Endoskull Necklace Charm Prototype measuring 1 1/4" high by 3/4" wide, was sculpted, molded and cast in 1998 / 1999.
As you know, Icons was the first licensee for Terminator production replicas, including props and 1:1 scale full-size figures including the Endo-Skull, Endo-Arm, Endo-Rifle and Endo-Skeleton, which were also sold and displayed at the Universal Studios T2-3D attraction in Universal City, California.
This one-of-a-kind prototype casting was produced at Icons as a lower-price point novelty product, which would have been cast in white metal, polished and sold as a Terminator Endoskull necklace or bracelet charm, exclusively in the T2-3D attraction Gift Shop.
Note the red-line ink on the lower portion of the jaw hand-drawn during the engineering phase.
As you can see, the detail is amazing. A miracle that piece survived !!!