Identification Help Needed Vorwarts Weekly Tax

I have had this stamp for about 40 years. I don't remember where I got it. A google search revealed nothing.

Vorwärts was the bulletin of the Social Democratic Party of Germany, which had members in the United States too.

This was a weekly "dues" stamp for membership. Many political organizations of the early 20th Century charged dues by the week to make membership more accessible to the working class. These "stamps" would probably have been pasted in a book, to be shown to officers upon request. Meaning unknown for "R. & St. U. V," possibly the abbreviation for a local chapter.

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Excerpt from the Great Soviet Encyclopedia, 1970-1979:

Vorwärts: A German newspaper and principal publication of the Social Democratic Party of Germany from 1876 to 1878 and 1891 to 1933. Vorwärts was originally published in Leipzig and after 1891 was published as a daily in Berlin. While the Exceptional Law Against the Socialists was in effect, from 1878 to 1891, the newspaper was prohibited. Until 1900 it was the main militant publication of the revolutionary proletariat. For many years, W. Liebknecht was editor of the paper. Later, reflecting the evolution of the leadership of the Social Democratic Party, Vorwärts became a tool of opportunist elements. It ceased to exist shortly after the establishment of the fascist dictatorship in Germany.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

Hello,
may I attract your attention to the wiki article
http://en.wikipedia.org/wiki/Vorw%C3%A4rts
So the newpaper is dead, but somehow its corpse continues to stay alive.