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Olkusz is a town east of Katowice.
In Olkusz, Austro-Hungarian fieldpost stamps (Michel 53-55, 57, 59, 66-68, 70 and 73-75) and an Austro-Hungarian newspaper stamp with Mercury's head (Michel 50) were overprinted "Polska Poczta Olkusz ....." (in three rows), colour: black, overall width: 20 mm, overall height 16½ mm.

Olkusz overprint
1 Heller 2 Heller 3 Heller 6 Heller |
12 Heller 60 Heller 80 Heller 90 Heller |

3 Kronen
Emperor Karl I overprints
10+10 Heller 20+10 Heller 45+10 Heller Karl and Zita overprints | ||||||||

6 Heller
Mercury's head overprint
Examples of Olkusz cancellations
Examples of reversed Olkusz overprints | |||||||