 The Rock-a-Stack was produced at Fisher-Price's production facility in Holland, New York from 1962 until the factory's closing in 1990 when production was moved to other facilities in Murray, Kentucky and Mexico.Former employees of the Holland, New York factory each received a Rock-a-Stack as a parting gift on the final day of operations at the factory.Since the Rock-a-Stack's initial release in 1960 some key design changes have taken place