Mai Kai Mystery Bowl by Otagiri. OMC sticker outline on bottom.
Original Otagiri Mai Kai Mystery Bowl. I would imagine this bowl came after the gray version by Harper. The bottom of the bowl still has the recognizable OMC sticker outline. The bowl is GIGANTIC. 9" diameter and 3 1/2" deep. Top of the figure to bottom of bowl is 6" and full diameter including figures is 11 1/2". It has the raised outline inside the bowl for the iced volcano cone. "Mai Kai" is on all four sides in slightly different styles. The Dynasty bowl seems to be a copy of the Otagiri version. Very cool!
Here is some discussion about the different bowls...
This bowl was used for serving the classic Mystery Drink cocktail at the Mai Kai. The bowl has brown sides, a white interior, and four brown and white shaded, open-mouthed tikis. "Mai Kai" is on the four sides of the bowl. This is the Otagiri version which preceded the Dynasty version.