Swip Stolk , Groninger Museum # NIEUWBOUW/ RUWBOUW # 1993, mint
Swip Stolk / Groninger Museum # IL MONDO SPECIALE, yellow # Mendini ao, 1990, mint
Groninger Museum, Swip Stolk, Mendini ao # IL MONDO SPECIALE , green # 1990, mint
Groninger Museum # SWATCH & MENDINI / Alessi # Swip Stolk, 1992, mint