Subject:Re: Beautiful satsuma butterflies bowl, need ID. Thanks!
Posted By: Martin Michels Thu, Jan 11, 2018
Your mark is: Kotobuki 壽 (native Japanese Reading = KUN-reading) and is displayed upside down, see my included picture.
It can also mean "Ju" in the Japanese Chinese reading (ON-reading).
The character means: congratulations, long ife, celebration, rejoicing or happy event.
It might also be a surname, perhaps Kotobuki Otori.
No idea about the age of your bowl, perhaps another Forum member can help you with that.