UNSERE BUNDESBRUDER, MARSCH EINS, MARSCH ZWEI-UND-DREI

Original old advertising or event stamp that were used at the time for advertising. Most of these stamps were published between 1900 and 1918. Some had wording on the reverse TUCK'S KUNSTLER POSTKARTEN-MARKEN-BILDER SIND RARITATEN, DENN DIESELBEN SIND NUR IN BESCHRANKTER AUFLAGE GEDRUCKT. VON DIESER MARKE EXISTIEREN NUR 3000 EXEMPLARE.--as per Google translate this states
TUCK'S ARTIST POSTCARD BRAND PICTURES ARE RARITIES, BECAUSE THE SAME ARE PRINTED ONLY IN RESTRICTED ORDER. THIS BRAND ONLY EXIST 3000 COPIES.

without gum, wording on reverse