Algemene Vereniging Radio Omroep) or in English: "General Association of Radio Broadcasting" was a Dutch public broadcasting association based in Hilversum, Netherlands. Their first transmission took place in July, 1923 under a different name and became AVRO in 1927. A merger with another Dutch broadcaster in 2014 resulted in the formation of AVROTROS. The slogan on the above decal translates to "In full swing."
AVRO sponsored a chess tournament in November, 1938 which brought together the current world champion as well as every major challenger at the time. The matches started in Amsterdam with each successive round played in a different Dutch city.