The emblem of Schwäbisch Gmünd in the middle with writing around the edge - Devalued coins might have a hole in it, or pressed flattish. The coins were issued to buy food from a Society during the inflation time in Germans post World War 1
Obverse lettering
CONS.VEREIN
*SC[HW. GM]ÜND*
Obverse script
Latin
Reverse description
Marke at the top 10 in the middle. Before devaluing, Pfennig would have been where the hole is now