AO-3912–1, 2005, The Art of Disney Celebration, Digital Color Postmark Mickey Mouse, Add-on, SC-3912, FDC

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.