This June 18, 1943 wartime slogan cancel of Germany is a result of the relentless allied bombing campaign.
Slogan reads, "Refrain from making private calls on the telephone after air raids!"
8 pf. franking indicates local mailing weighing less than 20 grams. Worms 2 post office was at 5 Bahnhofstrasse. With old Germany, in very many cases, the "2" post office was near the main train station.