Eliot The Great Pyramid Pocket Puzzle, 1981.

Manufactured by Eliot, this is a vintage mechanical twisting combination puzzle titled The Great Pyramid. Constructed from plastic components, the puzzle features a tetrahedral shape with four triangular faces. Each face is decorated with a geometric pattern in red and white with blue borders. The mechanism utilises clear plastic knobs on each face to facilitate rotation and combination changes, with the manufacturer claiming over 62 billion possible combinations. The item is housed in its original clear plastic rectangular display case with a red cardboard internal support that provides product information and branding. The insert is marked with the text An Eliot Invention and The Great Pyramid Pocket Puzzle.