Sake Cups?

This is a set of 5 sake cups.  I say sake cups because I am not sure what else they could be.  They are only 1 1/2 " tall so they are most likely for alcohol, not tea.  I have no idea how old they are or if they are Chinese or Japanese.  They are very light so I believe that they are most likely porcelain.  They are a pretty burnt orange in color and the designs are made with gold colored paint.  The designs look like clouds and a flying hat to me but I could be wrong.  The inside of each cup is white.  Instead of flat bottoms each cup has an arc shaped design that ends up making 3 feet/stands for the cups to stand on.  You should be able to see this effect in the photographs.  The only identifying mark is on the bottom of each cup.  I have included a photograph of it.  It may be a symbol or it may be Chinese or Japanese lettering.  Any help is appreciated.