1930s Union K Czechoslovakian Lusterware Porcelain Pitcher - 6 In

Lusterware is a type of pottery glaze that produces an iridescent, metallic sheen, often mimicking precious metals like gold, silver, or mother-of-pearl. This technique involves applying metallic oxides to the surface of the pottery and firing it in a kiln under specific reducing conditions. Czechoslovakia, known for its high-quality porcelain and ceramics, was a significant producer of decorative wares during the interwar period. The "Union K" marking, as indicated by the search results, likely refers to a specific manufacturer or distributor within the Czechoslovakian ceramic industry, contributing to the item's collectible appeal.