Since the publication of the original blog page related to the description of stamps linked to the 150th UPU anniversary (October 9, 2024) and the first update, as expected, additional stamps and countries have been discovered and are now described below. It seems this is still not the last update. This complementary list is divided on the basis of the same structure as the one provided earlier, in the first update:

1. Countries of Type A (Twin [T1], same date, same design), additional country: El Salvador (October 9, 2024).

2. New country of Type B (Concerted [C1], different dates, same design): Nepal (December 17).

The Dominican Republic stamp was issued October 26, 2024 and therefore has to be moved in this sub-category. Same for Lybia which stamps were issued on October 22, 2024 instead of October 9, 2024. In Iran, two stamps appeared also, printed in miniature sheets of 4 stamps but in fact made of an illustrated label with the UPU anniversary logos, attached to a stamp with text only. It seems that these stamps correspond to (privately) personalized stamps with limited printing runs (additional information is needed here). As belonging to this sub-group, these two stamps will be described in the catalogue in italics characters.

3. New countries of Type C (modified design – only logo [T2], [C2]): Ghana (), Italy (November 21), the Philippines ().

The exact date of issue for the Uzbekistan stamp is known now to be May 17, 2024. The United Nations stamps (Geneva, New York, and Vienna) had to be re-integrated in this category as the miniature sheets of 9 stamps [3×3] bear in the top margin the logo of the 150 UPU anniversary. These stamps were issued already on May 30, 2024.

Special miniature sheets including eight different countries have been produced and should be considered as se-tenant issues [S]. These stamps were printed with two different denominations, as perforated and non-perforated miniature sheets, at very low printing runs (100 units for each of the two perforated miniature sheets and 30 for the non-perforated ones). The countries involved in these items include Burundi, Central Africa, Djibouti, Guinea, Guinea-Bissau, Liberia, Sierra Leone and Togo (with stamp type B for this country). Due to the small printings runs, these miniature sheets must be considered as material to abuse collectors. They will be listed in the catalogue but in italics, just for information purpose. The printer of these countries also decided to create two postal cards per country with the same indicia (postal stationery) as pane stamps and souvenir sheet stamps, sold at very high prices, which must also be considered with the same status (abusive).

4. New country of Type D (different design, but same date [P1]): Honduras (October 9, 2024), 2 stamps

5. New country of Type E (different design, different date [N]): no new stamps

The UPU anniversary related stamp from the Netherlands is not an official Dutch post issue, but a personalized stamp, meaning it has to be filed as of private origin, in limited edition (information provided by Cesar Ittman, the Netherlands). The situation is similar for the Liechtenstein stamp, the second French stamp, Iran stamps, which are all to be considered as personalized or customized and/or private issues (all to be reported with italics characters in the catalogue).