On the reverse signed, titled and dated with brush in black: H. MIDDENDORF „IM SPRUNG“ 1981
In virtù del possesso delle mani. Gibellina/Italy, Museo Civico d`Arte Contemporanea di Gibellina, 1982, ill. unpaginated / Thinking of Europe. Reykjavik, The Living Museum, 1992, ill. unpaginated
Studio d'Arte Cannaviello, Milan / Private Collection, Italy / Private Collection, Rhineland