[ryuurui]

i can tell you already that if that first work does not have a second seal it's worthless in my opinion. It points at two things:

1. If a piece of calligraphy written by the greatest master of them all has no seal on it, it has no value (money wise, as it is still priceless for us, calligraphers). And in this case, there should be two seals (name seal cannot be pressed by itself, as intaglio seal is too heavy to exist on its own)

2. The artist does not really know the art of calligraphy if he does not know the most basic rules of pressing seals, which in calligraphy are equally important as the work itself, the sig, and the framing.