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The Switzerland 10 Francs Banknote was issued by the Swiss National Bank in 1987. Its obverse portrays mathematician Leonhard Euler. Its reverse side is vertically oriented and shows a water turbine, the solar system, and a scheme of the propagation of light through lenses. Security features include a solid security thread and a watermark of Leonhard Euler. The reddish-brown banknote is 137 mm x 66 mm in size and bear the signatures of Dr. Francois Schaller and Dr. Pierre Languetin. This particular banknote is in uncirculated condition and has been TAP authenticated with a grade of 60 to 70.