Uhl miniature pottery slipper with handpainted design is shown on pg 118 of Feldmeyer & Holtzman Uhl Pottery ID & Value Guide. Fired glaze is prussian green; decorative pattern is over-the-glaze cold paint utilizing circles and lines in white, orange & moss green. This lunch hour creation, so called because employees enhanced some pieces on their own initiative, is not marked, but there is an unreadable red marking in the shank.  Size is .3 x 1.25, .8 oz. The UHL factory closed in 1944. This item is believed to be c. 1920-44. Condition report: Very good; the cold paint is mostly intact and is actually better than the referenced example.
Item #1030, Price $35.