I do not see it as a heavy dish since it weighs over 6 lbs. It was cast to last. The bottom would not have to be finished if it was resting on a stone base. When I look at photo 1, I see a green patina where it would have been harder to clean (around the detail on the lip). The pits also have this same color patina in the bowl. I surmise that it was cleaned. I still believe it was cast and rested on stone (marble maybe?). There were only 3 kinds of people could have afforded this. Either the monarchy, the rich, or the church.