Rudolph D黨rkoop; Justus Brinckmann; silver gelatin paper; black and white positive process; image size: height: 16;40 cm; width: 11;90 cm; dry stamp; D黨rkoop; 1915; inscribed: verso and center: handwritten in lead: photographer; technique; measurements; inventory no; portrait photography; half-length portrait; man; beard; historical person; museum; museum staff