AO 4465-1, 2010, Negro Leagues Baseball, Digital Color Postmark, Add-on Cachet, First Day Cover, SC 4465
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.