AO-3783-3, 2003, First Flight, Add-on Cover, FDC, Pictorial Postmark, Orville Write, Kill Devil Hills NC
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.