Postal cards with Fischer 16-17

Plebiscites - Górny Śląsk (Upper Silesia)
Fischer Cp 3-4 GÓRNY ŚLĄSK | Year of issue 1920

The postal cards have inscriptions in German, French and Polish: POSTKARTE, CARTE POSTALE, and KARTA POCZTOWA.
Cp 3 and 4 have stamp images like (Górny Śląsk) Fischer 16 and 17 respectively.

Cp 3

Cp 4