Does anyone know the meaning of the letter stamped on the bottom of the Le Creuset pots? I'm looking at buying a used one and have encountered the letters 'G', 'B', 'H' thus far. Does it have anything to do with quality (ie. factory seconds). My hunch was that it referred to a specific line, but when I went on their website, I couldn't figure out how those letters I had encountered fit into my hunch. Any illumination on this matter would be most appreciated. zhourunping@yahoo.com