AO-3807, 2003,Mary Cassett Paintings , Add-on Cachet, First Day of Issue, Columbus OH, Child in a Straw Hat

Add-on cachet is:

A cachet design added to a cover which was originally uncacheted. An add-on cachet should be identified

by maker and date (mine are stamped on the back with the date) so that it is clear that it is not contemporary with the cover.