This stacking lusterware set is pretty boring when completely stacked because the combined shakers look like a simple egg in that format.  But lifting the top half of the egg reveals a baby chick inside.

Stamped "Japan" this set is very small at only 2'' in height.  Two color variations are depicted below.  Both having 6 and 3 pour holes with cork stoppers.  Circa 1920s-40s.

Lusterware baby bird in nest stacker salt and pepper shaker
Lusterware baby bird in nest stacker salt and pepper shaker