Editing First day of issue (section)

===Cachet===
As the collecting of first day covers became more popular they began to appear on prepared envelopes, often with an illustration (commonly referred to by collectors as a [[cachet]]) that corresponded with the theme of the stamp.<ref>[[#Hudgeons|Hudgeons, 2009]], pp.592-609</ref> Several printing companies began producing such envelopes and often hired freelance illustrators to design their cachets such as [[Charles R. Chickering]] who in his earlier years designed [[postage stamps]] for the U.S. Post Office.<ref>[[#Lerner|Lerner, 2010]], pp.10-11</ref> Cachets, which should not be confused with postmarks, are basically rubber stamps. Postmarks can only be applied by official [[Post Office]]s whereas anyone can design a cachet and put it on their cover. A cachet makes a cover unique and helps tell the story of the cover.  It can say whether the cover was carried (for example, covers were carried on the very last flight of the [[Concorde]]), who the signer was or information about the postmark. Royal Mail no longer counts pre-decimal stamps as valid and won’t postmark them, a cachet can therefore be used to ''cancel'' a pre-decimal stamp on a cover. It provides a link between that stamp and the envelope. They can also be used to ''cancel'' [[Cinderella stamps]].<ref>{{cite web |last1=Buckingham |first1=Tony |title=Glossary |url=https://buckinghamcovers.com/glossary/glossary-letter.php?letter=C |website=Buckingham Covers}}</ref>