When did Haeger use a foil label marked Copyrighted The Haeger Potteries Inc Macomb Ill?

Haeger used a foil label marked "Copyrighted The Haeger Potteries Inc Macomb Ill" primarily during the 1950s and 1960s. This label was part of their branding efforts to signify the originality and craftsmanship of their pottery. The use of such labels was common during this period as a way to protect their designs and enhance the value of their products.