The article examines the exhibition history of hand-painted ceramic objects from the “Fajans” factory in Włocławek and the politics of regional contextualization during the period of détente in the 1970s and 1980s. It extends both existing scholarship on transnational art history in socialist Europe and the notion of cultural diplomacy, approached here in the context of regional politics and economic frameworks. The paper highlights the peripheral networks and movements that developed in relation to the socialist cultural politics of working-class artistic engagement and artistic practice as labor. Questions of cooperation between Poland and other socialist states are of particular interest, as are the implications of détente for East Central Europe. The reconstruction of the transnational circulation of “Fajans” objects is based on a comparative analysis of international “Fajans” exhibitions, using documentation from the archives of the Faience Department of the Museum of the Kujawy and Dobrzyń Land, as well as from the archives of the city of Novi Sad. Based on the researched material and the conceptual framework of transnational art history, the article proposes a concept of regional cultural diplomacy.