1976, Austria. Original artist's painting by Prof. Otto Stefferl for the issue "Viktor Kaplan, Inventor of the Kaplan Turbine". Acrylic on card with passepartout. Issued design. Size (netto) 252x195 mm. Some printer's notes on the reverse. UNIQUE ARTWORK. (Mi #1534) (MS) (Tax Method: Margin System) (Image)

1989, Austria. Original artist's painting by Prof. Otto Stefferl for the issue "Industrial Technology Exhibition [Magie der Industrie], Pottenstein" showing "Steam Engine". Acrylic on card with passepartout framing (corner crease). Issued design. Size (netto) 114x181 mm. Some printer's notes on the reverse. Additionally there are 2 more original artworks for the same issue showing non-adopted designs (acrylic on cards; sizes about 120x150 mm). UNIQUE ARTWORKS. (Mi #1954) (MS) (Tax Method: Margin System) (Image)

1989, Austria. Original artist's painting by Prof. Otto Stefferl for the issue "Industrial Technology Exhibition [Magie der Industrie], Pottenstein" showing "Steam Enginge". Acrylic on card with passepartout framing (little corner crease). Non-adopted design (mainly because of different coloring). Size (netto) 114x183 mm. UNIQUE ARTWORK. (Mi #1954) (MS) (Tax Method: Margin System) (Image)