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MaestroOsservanza. fr Maestro dell'Osservanza Piet avec Peter Volckamer et Saint Sbald actuellement au Monte dei Paschi di Siena Mitteilungen des Kunsthistorischen Institutes in Florenz vol no JSTOR MaestroOsservanza XVe sicle Custom marker PDold Uploaded with Monte dei Paschi Art Collection Maestro dell'Osservanza