 The chief engraver made final adjustments directly to the master die, rather than modifying a larger model to be placed in a reducing lathe.This diework was the technique which his father and predecessor as chief engraver had used; it was also the way in which Charles Barber preferred to work.Barber added his monogram "B" to the design; it is on the cut-off of the bust above the letter B in "Columbian", while Morgan's "M" is hidden in the rigging of the ship on the reverse.