This is a vintage Hobby Heaven ceramic slip casting spoon rest mold #783. It measures 8.5XC8.5X3".  The image is appx. 7X6.5".  It appears to be a retro, Mid century modern style.

All of the molds being offered I have not personally used. I recently acquired molds from a ceramics shop that used to operate in Chattanooga Tn. many years ago.  Some are used and some have never been used.  They are all listed as used, since none are new and some are 50 years old or older. I cannot speak to the quality of the molds, only to the visual condition. I try my best to describe any blemishes and add photos. Feel free to message me if you have any questions.