I think an >1oz International Letter is as good as use as any for those $2 Inverted Jenny stamps! : r/stamps
New report brings upright Jenny Invert tally count to 43
How the Inverted Jenny, a 24-Cent Stamp, Came to Be Worth a Fortune, At the Smithsonian
What are some ways in which stamp collecting has changed since stamps were first issued as part of postal service systems around the world? - Quora
4806a - 2013 $2 Inverted Jenny, single from pane - Mystic Stamp Company
Are postage stamps worth any money? - Quora
Rare US stamp 'Inverted Jenny' sells for record $2M
Rare US stamp 'Inverted Jenny' sells for record $2M
Inverted Jenny, Full Pane of 6 x $2 Postage Stamps, USA 2013, Scott 4806 : Office Products
I think an >1oz International Letter is as good as use as any for those $2 Inverted Jenny stamps! : r/stamps