This is a vintage, mid 20th century, American art pottery, shell or 'nef' form planter by McCoy pottery. The mold was produced in various glaze colors.This has less seen transferprint pattern and gilded spatter on it. In the image of the underside there appears to be an additional stamp under the maker name, which may explain why this is not done in a monochrome matte glaze. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.