Some mail artists add a stamp print to their mail art, saying 'Hannah Hoch Fan Club'.

Until I received these stamp prints I never had heard of this artist, who was born 1st of November 1889. She has been a collage / photomontage pioneer. She was part of the Dada movement and also became involved in the De Stijl art movement. 

For anyone who has a Hannah Höch Fan Club Stamp (and interested others, I haven't one), this group can be the place to share your thoughts and mail art, tributing to and/or inspired by Hannah Höch.