Nisko
Local postage due stamps
Fischer Pd9 Type 99 | Years of issue 1919-1920/h2>
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Nisko type 97 is a black wooden handstamp overprint (a bold "PTO:", of which the "O" is open at the top, size 26 x 11 mm).
Nisko type 98 is a black or violet rubber handstamp overprint (a bold "PTO.", size 29 x 12½ mm).
Nisko type 99 is a black wooden handstamp overprint (a bold "P.TO", size 26 x 13 mm) on official stamp Fischer U6.

Pd 9 (U6)
Nisko Type 99 overprint