- Portugal: In 1923, the Portuguese Aeronautica Militar (Military Aeronautical) decided to update their training airplane fleet. In order to do so, they bought a Caudron C.59 and was confronted with an Avro 504K, which won. They were ordered on 10th November 1923 and arrived on 20th May 1924. Most of them were used in the training/school role at the Portuguese Escola Militar de Aviaçao (EMA) - Military Aviation School located in the city of Sintra, until as late as 1937. In 1925 two of them were given to the Naval Aviation, being this way the first land-based airplanes operated by the Portuguese Navy.
- Switzerland: The Swiss Army Aviation service bought some of them and operated them in Geneva, however further details are unknown to us.
- USSR: As the USSR built it's own copy of the Avro 504K, it's known that at least one original 504K made by Avro was taken as a model and copied later through reverse engineering.
Sources:
1. http://asasdeferro.blogspot.com.es/2016/04/avro-504.html (translated)
2. Salamander Books - The Complete Book of Fighters
3. http://forum.valka.cz/topic/view/86602
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