Second Edition

A second edition is a later printing, usually authorized by the artist or by the heirs, from the original matrix, after an edition of declared number has already been printed. It should be annotated as a second, or subsequent, edition. A photographically produced replica of the original print, whether printed in a limited edition or not, is not a second edition; it is a reproduction. 

Source: http://www.ifpda.org/content/collecting_pr...