Vintage Kerr Half Pint Crystal Squat Jelly Canning Jar with its lid. This jar is characterized by its ribbed or fluted glass design and squat, half-pint size. The metal lid is embossed with "Kerr Jelly Glass". These jars are typically associated with the mid-20th century, with some sources suggesting the 1960s. Originally designed for canning and preserving, particularly for jellies and jams, their compact size and design also make them popular decorative items today.