Semi-matte olive green glaze on interior. Bottom has incised artist mark and dated 1959 (possibly 1958). One bowl has a small chip along upper rim (last photo).All others are in excellent vintage condition. The item "Mid Century Modern Studio Pottery Bowls (4) Signed Dated 1950s Vtg Ceramics" is in sale since Tuesday, October 8, 2019. This item is in the category "Pottery & Glass\Pottery & China\Art Pottery\Studio/ Handcrafted Pottery". The seller is "lots_vintage" and is located in Ferndale, Michigan. This item can be shipped to United States.