Czechoslovakian "Guinea"

This unusual machine made marble made in Czechoslovakia in the 1950s or 60s is about 1 inch and a little out of round. It has a cream colored base with multicolored spots.

Christensen Guinea circa 1930s

Guineas are arguably the most recognizable marble made by Christensen Agate. Made in the 1930s, the blue and amber based guineas pictured measure 9/16".