This undocumented mark is comprised of two parts.
The upper part has a Rectangle with two symbols inside. On the left side is the 'Hoko' symbol. On the right, is a single 'hash' mark.
The lower part of the maker's mark has a Circle with the 'Tokui' symbol inside.
This mark seems to be pretty rare since it's not in any beachcombing field guides.
This float measure 3 inches in diameter.
Found in Hawaii.