The earliest extant letter in Gluck's hand; notes the correspondence between Gluck and Franz and Marianne Pirker in 1748, in which Gluck gave various commissions to the Pirkers, including an order for a watch. Reproduces text and facsimile. *Tenschert, Roland. "Documente des Lebens." Christoph Willibald Gluck. Der grosse Reformator der Oper. Cited below as item 150.