Amsterdam: Art & Project, 1972, 29,6×20,9 cm. Single sheet folded once as issued from a print run of 800 copies, more than half of which were folded in three for mailing. Early artist’s project / conceptual piece documenting his Lavori Postale series.
[Ref: Leiber 2001, p.130; Lailach 2005, p.96]