Vincenc Josef Rott, founder of the V. J. Rott company in Prague, portrait by Canon Straširybka, 1856 [of the painting photographed/scanned by one of Vincenc Josef's heirs, Vladimir J Rott (vjrott.com): Canon Straširybka, Hans Canon, Johann Baptist Strašiřipka / Johann Baptist Straschiripka / Hans Purschka-Straschiripka (1829-1885, Vienna) / photo/scan of one of the Rott family's pictures, relased by Vladimir J Rott (vjrott.com) - CC 4.0 or whichever may apply -- Public domain -- http://commons.wikimedia.org/wiki/File:Vincenc Josef Rott 1856.jpg]