The forum software here is a joke. I lost my text two times because of session time outs during my research. OK. Here's another try written in an external editor.

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Seems to be a business rubber stamp with a full address of a lab Marta had in Hofheim.

For me this is the full text:

Marta Hoepffner
Fotowerkstätte
z. Zt. Hofheim/Ts.
Borngasse

Fotowerkstätte (Fotowerkstaette without the German umlauts) is an old term for a photo lab. Today we call it "Fotowerkstatt" or simple "Fotograf". "z. Zt." is short for "zur Zeit" and means "at the moment residing at".

A study of these links

http://www.hoepffner-preis.de/mh_bio.htm
http://www.hoepffner-preis.de/fotoschule.htm

shows that she had to move from Frankfurt/Main in 1944 to Hofheim and give up her old lab. And she may also did portraits in Hofheim.

One thing is strange to me. The woman looks like herself. The face morph and the eyes are similar to this:

http://www.elvira-von-seydlitz.de/hoepffner-schoffers/a4a.gif (1941)
http://www.hoepffner-preis.de/bilder/start_portrait.jpg (maybe 20 years after the end of war)

I don't know if Marta was such a famous person at the end of war. Maybe she sold postcards of German Fräuleins to GIs and used herself as a model.

Maybe this helps a bit.

Apollo 2007 Freebies Listing, free V4 and Apollo stuff