Not surprisingly, all three are Inter-Governmental Philatelic Corporation clients. Surprisingly, it took six days for these stamps to be announced. However, note that Tuvalu, Papua New Guinea and Grenada are all members of the British Commonwealth. Here’s the press release:

[press release] [click on any of the pictures for larger versions]
Elizabeth II: The British Queen Dies At 96
Nations Around the World Honor the Memory of Queen Elizabeth II on Postage Stamps

New York, September 14th, 2022 | IGPC is pleased to release the recently approved stamp images honoring Her Majesty Queen Elizabeth II. Visuals of the official postage stamps In Memoriam of the Queen from the nations of Grenada, Papua New Guinea and Tuvalu are attached. We anticipate the release of additional Nations, which will be shared soon.

On 8th September 2022, Her Majesty the Queen, Britain’s longest-reigning monarch and a symbol of stability died at Balmoral Castle in Scotland. The Queen’s death comes seven months after she marked the 70th anniversary of her accession to the throne, a milestone achievement in her remarkable life.

At the very young age of 25, Queen Elizabeth II ruled seven Independent Commonwealth Nations making her the World’s longest reigning monarch since her coronation in 1953. Throughout her many decades on the Royal Throne, the Queen has witnessed major political change and engaged some of the most influential World Leaders, including thirteen United States Presidents.

Nations around the world have traditionally honored and paid tribute to the Queen throughout her beautiful life. Now Government Postal Authorities represented by IGPC mourn the passing of Queen Elizabeth II and honor her life and legacy with new official postage stamps. Of the first nations around the world to honor the Queen after hearing the sad news of her passing are the Caribbean Island Nations of Antigua & Barbuda, Grenada, St. Kitts, Nevis, St. Vincent & the Grenadines, the Pacific Island Nations of The Marshall Islands, Tuvalu, Papua New Guinea, the Central American Nation of Guyana and the African Nation of The Gambia.

Stamp collectors and enthusiasts will be sure to add these significant stamps to their collection and are able to purchase these stamp sheets from the local Post Offices of the issuing government or from their local stamp dealer. Additionally, stamps are available directly from the IGPC website at www.igpc.com.