The officers of the Chilean corvette O'Higgins received this tablet and the Large Santiago Tablet from Father Roussel on Rapa Nui in 1870. These two tablets have since been kept in Santiago, Chile, which explains their names.

Small Santiago Tablet was the tablet which initiated the attention and curiosity of the civilized world to the rongorongo script. (Fischer)

Pictures (Barthel):

There are 8 + 8 = 16 rows of glyhps on this tablet. The type of wood is unknown.