he uniqueness of the "perfectly imperfect" Rae Dunn products 

Slight imperfections are part of Rae Dunn's uniqueness and design.  Smears on font, glazes over nick, pinpoint/pinholes, glaze pop, glaze slip, are all examples of perfect imperfections.  Some mugs are slightly heavier, wider, taller and have varying shades of white due to different releases.