Stack's Bowers | Welcome to The Q. David Bowers Reference Collection of Encased Postage Stamps Featured in Stack's Bowers Official Auction of the ANA World's Fair of Money.
Robert A. Siegel Auction Galleries, Inc. Sale - 1066 Page 37
Worldwide: Encased Postage Stamps | The Stamp Forum (TSF)
Civil War Echoes: The Enduring Allure of the Encased Postage Stamp — DJR Authentication | An Appraisal & Authentication Co. | Charleston, SC
Encased Postage Stamps | National Postal Museum
Scotsman Auction Co. - Lot #232 - Pair of encased postage stamps
Robert A. Siegel Auction Galleries, Inc. Sale - 1066 Page 37