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In Grodzisk, today called Grodzisk Mazowiecki, Generalgouvernement Warschau overprints (Michel 6-10 and 12-16) were additionally overprinted "Poczta Polska" and four horizontal bars (overall size: 17½ x 17½ mm). The overprints are black or red. Michel 13 (20 Pfg) was overprinted black or pale blue, but not red.

![]() Michel 6 |
![]() Michel 7 |
![]() Michel 8 |
![]() Michel 9 |
![]() Michel 10 |
![]() Michel 12 |
![]() Michel 13 |
![]() Michel 14 |
![]() Michel 15 |
![]() Michel 16 |

Examples of Grodzisk cancellations
(Urząd Pocztowy Prowizorio Grodzisk = Provisional post office Grodzisk)