LUBETZKO . 10.1920 single circle (197.1) on package card with 25 Pfg brown, 50 Pfg grey vertical pair at back, 2 Mark dark brown horizontal pair on face postage stamps issue 1920 to Nauen, the 25 Pfg-stamp with mirror-inverted perfin (perfin) S. F. R (S. Fränkel linen factory, Ratibor ?, comp. Handbook number 17, normal perfin: "very rare") arrival postmark single circle NAUEN at back, transport traces