In 2003, ASEAN countries and Japan had an ASEAN-Japan Exchange stamp issue to commemorate the ASEAN-Japan Cooperation. Each ASEAN country was supposed to come up with their own stamp designs.
Japan did a whole set on their own where they depicted one particular scene of each country. If you look at the stamp for Brunei, you would see the dome of SOAS Mosque. This probably marked the first time that the SOAS mosque appearing in another country's stamps. I don't think there has been another ocassion for that.