It will add the Gibbons range to its mail-order business, which already includes first-day postal covers and specialist coins.

Because this was strictly an experiment, the mail consisted entirely of commemorative postal covers addressed to a host of government officials, including President Eisenhower.

"Then you better move it to the PPK." PPKs were the astronauts' personal preference kits, bags of family memorabilia, postal covers, and commemorative coins.