Opole 9.2.1921 ZKr (237.7) on registered letter with multiple franking 10 Pfg / 20 Pfg blue block of eight as center piece (field 94-95 96-97 / 104-105 106-107) overprint types IIIa in each case at of the left and IVa in each case at the right side, 10 Pfg / 20 Pfg blue block of four overprint type IIIa provissional issue 1920 to Doebern, arrival postmark ZKr DOEBERN (Lower Lusatia) 9.2.1920 at back, very neat and clear postmarks repulses, transport traces