The cities of Koln and Aachen were in the administrative district (Gauwaltung) of the German Labor Front (Deutsche Arbeitsfront or DAF). Apparently Wolfen has a canteen (kantine) token worth 20 pfennigs from that area. The example in the picture comes from the forum at WarRelics.eu where various experts comment on the scarcity of this piece.

Attempting to place an approximate value on such tokens is difficult. There is a strong following of German Third Reich memorabilia, and this pushes value up. However, tokens in general are collected with far less vigor than legal tender coins, and this pushes value down. Finally, the fact that the collectors at War Relics have not seen this particular pattern works in favor of high value. My guess at the value of Woflen's token, which is sorely damaged with scratches and corrosion, is $20 US dollars. If it were in good shape, with no damage, value would probably be $100 or more.