A PAIR OF CHINESE EXPORT OVAL REVERSE-GLASS PAINTINGS, LATE 18TH CENTURY, One depicting a lady wearing a hat with a background of trees, the other a lady in a floral headdress, holding a flower and seated at a window, each with details highlighted in gilt, in giltwood frames, each with various trade labels to the reverse, 5 ? x 5 1/8 in. (14.5 x 13 cm.) framed