St. Vincent celebrated Princess Diana's 21st birthday with the release of this set of three mint stamps in June of 1982. This complete set features Augusta of Saxe-Gotha (Princess of Wales, 1736), the Paternal Arms of Augusta of Saxe-Gotha, and Princess Diana (Princess of Wales). The retail value of this set is $2.75 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 5).

This complete set of three mint stamps, originally issued by Montserrat in 1982 to celebrate Princess Diana's 21st birthday, were overprinted and surcharged for official use and re-issued on Oct. 19, 1983. The overprint, "O.H.M.S.," stands for "On Her Majesty's Service." The stamps feature Catherine of Aragon (Princess of Wales, 1501), the arms of Aragon, and Princess Diana. The retail value of this set is $4.40 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 4).

Tuvalu paid tribute to Princess Diana on her 21st birthday (July 1, 2025) with the release of this complete set of three mint stamps. The stamps feature Caroline of Brandenburg-Ansbach (Princess of Wales, 1714), the Brandengurg-Ansbach arms, and, on the high value stamp, Diana, Princess of Wales.

This postally used (cancelled) stamp was issued by Australia on July 29, 1981, to celebrate the Royal Wedding between Prince Charles and Lady Diana. The retail value of this cancelled stamp is $0.60 (Scott 2007 Standard Postage Stamp Catalogue, Vol. 1).

Belize issued a set of three stamps on May 20, 1982, to pay tribute to Diana, Princess of Wales, on the occasion of her 21st birthday. This item is a set of three complete cancelled sheets; one sheet per stamp issue with six stamps per sheet. Each sheet additionally includes three labels and decorative selvage.

Issued by Montserrat during 2007 to pay tribute to Princess Diana (1961-1997) on her 10th memorial anniversary, this small mint stamp sheet features a high value stamp ($7.00) with a beautiful portrait of the Princess.

Tuvalu memorialized Princess Diana of Wales (1961 - 1997), ten years after her death, with the release of this attractively-designed mint sheet of four stamps in 2007. Each stamp features a different portrait of Princess Diana; a large sitting portrait of the Princess is included in the sheet selvage.

Antigua paid tribute to Princess Diana's 10th Memorial Anniversary with the release of this mint stamp sheet during 2007. The sheet includes four high value ($2 each) postage stamps, each featuring a different portrait of Diana, Princess of Wales (1961-1997). Antigua, a former British colony and associated state, is an island group (includes Antigua, Barbuda, and Redonda) in the West Indies, southeast of Puerto Rico.