When Takasuke MITSUI, the 6th head of the Mitsui-Kita family that was the eldest son's lineage of the house of Mitsui, was invited to the Wakayama Castle town (the town developed around the Wakayama Castle) (Nishihama-goten), Harutomi painted a turtle on the tea bowl that was hand-made by Takasuke.
三井家の惣領の家柄である三井北家6代三井高祐が紀州和歌山城下（西浜御殿）に招かれた際には、高祐が手造りした茶碗に治宝が亀の絵を描くなどしている。