Jamacoaque Sello from Ecuador, ca. 300 BC - 400 A.D. An excellent Jamacoaque sello (roller stamp) from Ecuador, ca. 300 BC - 400 AD. This choice example is a 2-1/2 long, 1-1/8 diameter solid sello with intricately stylized designs. Ex Melnick collection. Value range: $150 - $200.