This is an antique used F. W. Devoe & Co. white ceramic or porcelain 6 position paint palette that could be used for oil, acrylic, or watercolor paint. The piece is about 8" by 3" by 3/8" and it looks like a slab.
8-Well Porcelain Artist Paint Palette, Mixing Ceramic
8 Inch Porcelain Watercolor Palette 8 Wells Ceramic
Consigning For Good
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Catalog - Important May Estates Auction: Session I
This is an antique used F. W. Devoe & Co. white ceramic or porcelain 6 position paint palette that could be used for oil, acrylic, or watercolor
F. W. Devoe & Co New York Antique Ceramic Porcelain Watercolor Palette 8 x 3