The Kaestner family was a prominent porcelain manufacturing dynasty in Saxony, Germany. The "Saxonia" mark, often accompanied by a crown and crossed swords, is associated with the Friedrich Kaestner porcelain factory, which operated from the mid-19th century until the mid-20th century. They were known for producing a wide range of decorative and functional porcelain items, including dinnerware, vases, and figurines, often in styles popular during their operational period.