Signed and dated, in pencil, lower right: Lurcat 1938
Inscribed, in pencil, on verso, lower center: 4046 (circled) Inscribed, upper center, a series of numeric inscriptions and calculations: 245/16 (underlined)/405, 445/16 (underlined)/605, 428, 242, 45/16 (underlined)/59, 245/16 (underlined)/405