This 3 inch float has an undocumented mark.  The symbol appears to be a 'To' 斗 symbol. It's an 'X' with two dots in one of the quadrants 斗.  This Kanji symbol means 'Big Dipper'.

There's also some light amber green swirls near the seal button that adds the attractiveness of this float.

This float was acquired from an antique seller located in Waianae, Hawaii.