BERTINI Gianni VIVIANI Vanni

Signed "Bertini" (lower left); signed "Viviani" (lower right) Signed, dated, numbered, titled, signed "Viviani, Bertini, 73, 73346, A Bertini la patria, ovvero processo di bertinizzazione, Bertini, Viviani"; stamps of the two artists; stamp of the Musée d'Ixelles, Bruxelles (on the reverse)