The Opal Sky by tebothibeau | Nov 30, 2016 The Opal Sky CR #: 1286 Date: ca. 1950s Medium: Watercolor over graphite pencil on paper Dimensions: 15-1/2 x 21-1/2 in. Signature: Unsigned Credit Line: Provenance: Estate of the artist to Anne M. & Edgar F. Hubert. Sold by the estate.