The complete set in detail

RD001
Sc.No. OL1
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - blue-grey ; 2 Pfg.

RD002
Sc.No. OL2
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - brown ; 3 Pfg.

RD003
Sc.No. OL3
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - green ; 5 Pfg.

RD004
Sc.No. OL4
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - red ; 10 Pfg.

RD005
Sc.No. OL5
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - blue ; 20 Pfg.

RD006
Sc.No. OL6
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - red and black / yellow ; 25 Pfg.

RD007
Sc.No. OL7
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - carmine and black ; 40 Pfg.

RD008
Sc.No. OL8
1903 - Official stamp for Prussia : Inscription 'Frei durch Ablösung Nr. 21' - carmine and black / brown-black ; 50 Pfg.