Circa 1937-1944: With only 21 items in the Fiesta Kitchen Kraft line the ball jars are among the most desirable. A real treat is to complete a collection of all three sizes or all twelve if you have the ambition. This example of the large sized covered jar in cobalt is sure to please even the pickiest collector. The wonderful simplicity of the ball shape mirrors other pieces like the salt shakers. The lids are notoriously known to be difficult to grasp and hard to handle, making this piece a rare survivor. To find a ball jar without damage and minimal if any factory imperfections is a great joy.