Rubik's Snake

Circa 1980's.
(plastic, 4 inches as assembled above)

A sequence of linked plastic pieces that can an be folded into fun shapes. The "solved" position is a 3D diamond shape shown above that fits into the plastic ball in which the puzzle was sold.

Further Reading
Rubik's Snake Booklet, from:
McFArren's Page, from:
McFarren's 3D Page, from:
Wikipedia Page, from:'s_Snake