Vintage Skeletons Diagram with Numbered Bones

Vintage darkly humorous black and white image of a skeleton couple, one facing front, the other facing back, seemingly holding hands and looking into each other's eyes, as though they are about to begin a dance. Each anatomically correct skeleton is diagrammed with numbered bones, at one time possibly used in a science laboratory of old, or a classroom receiving a lesson in the human skeletal system. Designs available in both black on white, and white on black.