Good new term I learned

A fancy cancel is a postal cancellation that includes an artistic design. Although the term may be used of modern machine cancellations that include artwork, it primarily refers to the designs carved in cork and used in 19th century post offices of the United States.

– from Wikipedia, which also informed me about the Waterbury Running Chicken (a famed fancy cancel) and that I should be vy suspicious of fancy cancels on Confederate postage stamps.