Almost all of Kasyu's works are made by hand and he is known for works such as teapots and incense containers shaped like vegetables.
If so the "pon" character is very simplified in this particular case.
This cemented him as one of the great masters alongside Donyu and Ryonyu.
- the highest appraised market value of art was over 6,000,000 JPY.
That is of course not set in stone but certainly a good start for further research.
Previous to 1891, items were either not marked at all, or marked with Japanese characters.