Chinese Cast Bronze Hand Mirrors

(lot of 4) Chinese bronze hand mirrors, the largest possibly Yuan dynasty, with a foliate edge and cast to the back with an eight-character inscription 'an ming gui bao, fo jian er jing' the next two said to be Song dynasty and based on a Han dynasty-prototype, one with the TVL design encircled by geometric and foliate bands, the other of similar design with the addition of small dragon figures, the last a small floriform mirror with traces of green enameling, largest 6.5''diam