I think an >1oz International Letter is as good as use as any for those $2 Inverted Jenny stamps! : r/stamps

An Inverted Jenny Surfaces. The Flawed Stamp Had Not Been Seen Since 1918. - The New York Times

Does anyone make art with postage stamps? - Quora

Postage stamps and postal history of the United States - Wikipedia

Rare stamp valued at $1.6 million

4806a - 2013 $2 Inverted Jenny, single from pane - Mystic Stamp Company

Lot of 2 Inverted Jenny Stamps Souvenir Sheet of 6 $2 stamps

Inverted Jenny, Full Pane of 6 x $2 Postage Stamps, USA 2013, Scott 4806 : Office Products

Why a single 'Inverted Jenny' stamp sold for $2 million at auction : NPR

Will an Inverted Jenny Turn the Stamp World Upside Down Again?

I think an >1oz International Letter is as good as use as any for those $2 Inverted Jenny stamps! : r/stamps

USPS issues surprise $2 INVERTED Inverted Jenny stamps! - Page 9 - STAMPBOARDS - Postage Stamp Chat Board and Stamp Forum

Rare US stamp 'Inverted Jenny' sells for record $2M

The 10 Most Expensive Stamps in the World