 An unnamed art collector moved the sculpture from Italy in the early 1920s, and by 1938 it was in Switzerland.Italian art historian Carlo Pedretti discovered the existence of the wax model in the late 1970s, and took black and white photos of it.When compiling a 1987 catalogue raisonné of Leonardo's drawings stored in the Royal Collection in Windsor Castle, Pedretti added some of his photos for comparison.