Monuments and symbols are often employed to legitimize political systems. Consequently, authoritarian symbology is a frequent target after democratic transitions, whose removal represents a break with a past that is not anymore deemed as acceptable. How do these de-commemoration policies affect public opinion? We take advantage of the Spanish Historical Memory Law 52/2007 to assess the effects of removing authoritarian symbology from public spaces due to policy prescription on the process of political socialization. Our particular case exploits the de-commemoration of the main pre-democratic symbol during Franco dictatorship—fascist Spain’s coat of arms—from an urban public high school. To do so, we will survey its approx. Three-hundred students aged over fifteen before and after the public works end. We will estimate the effect of the de-commemoration using a Difference-in-Differences setup by replicating the same fieldwork in two public high schools located in the same city. We further explore the mechanisms by observing whether consequences come from the de-commemoration itself or by informing subjects that this process is executed according to the Spanish Historical Memory law—policy prescription. We do so by incorporating a survey experiment in the second wave. This paper deepens to our understanding of the socialization dynamics in post-authoritarian democracies and provides empirical evidence to the debate of the consequences of de-commemoration policies.