This is a simple looking cachet features a question mark surrounding the letter "C", representing cancer.  There are no identifying markings anywhere on the cover and the Mellone Catalog has it listed as "Unknown Designer."  Personally, I really like the stark, yet simple image.  It reminds me a little of the uncataloged cachet I've titled COM/CAM, found later in this online exhibit.  The same type of stark black and white image is featured on both covers, plus the designer of both cachets is unknown.  If you have any information about who created either of these cachets, please drop me a line at smith@in.net.