Not sure what it is from or if it could be removed but it is very minor with no effect on display or use of bowl. The item "Gladding McBean CATALINA ART POTTERY Nautical Art Ware FISH WAVE BOWL California" is in sale since Wednesday, August 16, 2017. This item is in the category "Pottery & Glass\Pottery & China\Art Pottery\Catalina".
The seller is "chilibosworths" and is located in Gilroy, California. This item can be shipped to United States, Canada, United Kingdom, Germany, Japan, France, Australia.