On July 29, 2024, Argentina issued a pair of stamps depicting whales (Southern right whale – Eubalena australis and Humpback whale – Megaptera novaangliae) and entitled ‘200 years of Argentina – Colombia relationship’. Indeed, these stamps are the counterpart of the Colombia pair issued on December 29, 2023, based on the same design. As a consequence, this issue must be considered as a concerted issue that was recently completed and it will be described in the catalogue under the entry code [C20231229], added to the year 2023 section. Colombia issued 25,000 stamps in miniature sheets of two se-tenant pairs. Argentina issued stamps in panels of 12 stamps.

In parallel, Don Birschel (USA) provided an additional information about a Colombia – Peru issue that was missed so far. On May 27, 2022, Colombia issued at the occasion of 200 years of relationship with Peru, a miniature sheet with 4 different stamps showing a) the archeological site of Moray, Cusco, Peru, b) the Caño Cristales, river in the the Macarena mountains, Meta, Colombia, c) a llama and d) a sloth. It appears that Peru issued at the same occasion, but only on November 30, 2022, two se-tenant stamps with the same designs as the two first Colombian stamps (a and b). Of course, these stamps must be considered as a concerted issue and will be added to the catalogue under the entry [C20220527] in the year 2022 section.

By further exploring the “4-72” Colombia web site, it appeared that Colombia issued in 2022 and 2023, on top of the Argentina-Colombia joint issue, a series of relationship stamps that in theory could have led to additional concerted issues. These stamps celebrate relationship anniversaries between Colombia and Egypt (February 23, 2022), the United States (May 2, 2022), South Korea (May 6, 2022), Germany (May 8, 2022), Chile (December 29, 2022), Barbados (December 18, 2023) and Canada (December 22, 2023). To our knowledge, no counterpart stamps have been issued, but information from some remote countries such as Egypst of Barbados is often difficult to find.

In the same way, Peru issued, over the past years, stamps related to different relationship anniversaries with India (August 26, 2022), Guatemala (2022), Ecuador (October 23, 2023), Japan (November 13, 2023), and South Korea (November 13, 2023), but none resulted (so far and to our knowledge) in a joint issue (except the Peru-Poland issue already described in the catalogue as N20230927). Uruguay issued stamps in honor of relationship with Japan (July 27, 2021), Czech and Slovak Republic (November 17, 2021), Vietnam (April 27, 2023) and Chile (November 1, 2023). Paraguay issued stamps for relations with South Korea (June 28, 2022) and Mexico (October 3, 2023).

When doing such a screening with Chilean recently issued stamps, it appears that this country celebrated relationship anniversaries with Canada (November 18, 2021), Peru (December 2022), and the United States (January 27, 2023) without counterpart. All these stamps must be considered as unilateral issues and should not be reported in the catalogue unless a counterpart is found. This counterpart is not necessarily a stamp but could be postal stationery, like in the Peru-Poland N20230927 issues, even much more difficult to find. Any additional information from all these countries is welcome.