AO-3854-1, 2004, Lewis and Clark Expedition First Day Cover, Add On Cachet, Orofino ID, SC 3854
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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.