"FANCY" CANCELS OF U.S.A.
A fancy cancel is a postal cancellation that includes an artistic design, mainly used in 19th century post offices of the United States by the postmasters, in order to prevent reuse of the stamps. Their large variety finds a place in almost all the thematic collctions.
"Fancy" cancellation "archaic lyre"
Some examples of the large variety of the existing "fancy" cancellations