The Angel of No Man's Land, circa-1918.

This is the chorus to Angel of No Man's Land, a 1918 song dedicated to Red Cross volunteers who had entered No Man's Land-- the area where pretty much any soldier running across from his trench to attack the enemy would almost surely die-- to seek out to save fallen soldiers still alive during World War 1.

Here's the song:
http://collectarc.com/theangelnomansland.html

As for it's watermark of DRESDEN.... I dunno. That city was bombed out later in WW2. I noticed it accidentally in the dark when I picked it up to look at it.