Avigad already observed that the Hebrew seal cutters produced more glyphic seals in the eighth century B.C.E. than their seventh-century counterparts. There is a 4:1 ratio between the iconic seals of royal officials in the eighth century B.C.E. and the iconic seals, bullae and seals dating to the end of the seventh century B.C.E. See “Seal,” Encyclopedia Biblica (Jerusalem, 1958), pp. 67–86 [Hebrew]; Hebrew Bullae from the Time of Jeremiah (Jerusalem: Israeli Exploration Society, 1986), p. 118.