Human Muscular System, Large Pair of c. 1920s-40s Anatomical Drawings in Fantastic Color Colored

These large anatomical drawings show some creasing to the paper and a large tear coming down from the top of the posterior view, but the color and lushness of the rendering of the musculature is so fantastic, no way could I resist (and they feel like the perfect bases for tattoos, too!) Better in person, really super luminous.

Each 18" x 12". sold as a pair. Colored pencil on heavyweight paper. General wear and light creasing to side views, tears and roughness to the top of the posterior view as evident. Shot under fluorescent light, amplifying every crease! C. 1920s-40s I believe, signed lower right and undated.