I have a friend whose parents are avid collectors of misc. and I was fascinated with these pictures but for naught. They could not recall where they got them or what they were for/from. Imgur
This is from the Dance of Death of Basel, a series of copper engravings based on a mural of the same title in a monastery in the city. The Dance of Death was a popular motif in the early renaissance.
There's quite a good site dealing with Dances of Death here, the page on the Basel DoD here, and a translation of your specific page here.
