This model of a mill came as a sort of surprise to the purchase of my Han dynasty well. It is 20 cm wide, 14 cm high and 15,5 deep. It is covered in a green lead glaze, which is iridized due to long burial. It is to be placed in the Eastern Han dynasty, second half first, early second century a.D.  It is a repaired piece, with some filling in. We can see a mill, and a loose mortar.  Similar pieces in the Ontario museum, and Henan provincial museum.