The 1st set, having full wooden knights, was made in Czech before it was part of Eastern bloc under Soviet Union and the 2nd one, having plastic knight heads, during the 1980ies. Full plastic sets do exist as well.
This product would be a great fit for chess enthusiasts and collectors interested in vintage Czech chess pieces, with a specific focus on the 1951-54 "ČESKÁ KLUBOVKA" FIDE Tournament Czech reproductions in ebony/boxwood.
