AO-4268-3, 2008, Mount Rushmore, Add-on Cover, First Day Cover, Priority $4.80, Standard Postmark, SC 4268,
As you know USPS delivery time very a lot these days. Please let me know if you have any issues before opening a Case.
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.