The Dactus was introduced in the last year of the Epoch (2007), and had the same cartridge filling mechanism as the Epoch. The Ductus was effectively the successor to the Epoch. But, the Ductus was available only in silver (P3100) or gold (P3110) finish that the Epoch did not have. So, as it were, the Ductus was positioned as a high-end version of the Epoch, targeting at the high-end writing instrument market.