U.S.A. (1944) Clown* beating drum. Red meter cancellation on envelope Pitney Bowes No 58918: The Classified Telephone Directory Tells Who Sells! Save Gas!
AVAILABLE AT $25
U.S.A. (1954) Cirque Barnum. Eléphant. Empreinte rouge de machine à affranchir sur pli Pitney Bowes No 220182: "Le festival Barnum, 1954."
AVAILABLE AT $30
U.S.A. (1956) Circus elephant. P.T. Barnum. Red meter cancelation on piece, PB No. 337413: Barnum Festival - Bridgeport, Connecticut.
AVAILABLE AT $12
RUSSIA (1966) Crossing guard herding children across street to circus. 4 Kop postal card (N) with corner illustration.
AVAILABLE AT $12
RUSSIA (1966) Volgograd circus. Uprated 5 Kop postal card (O) with corner illustration.
AVAILABLE AT $12
RUSSIA (1976) Alma-Ata circus. 4 Kop postal card (N) with corner illustration.
AVAILABLE AT $12
RUSSIA (1976) Circus acts. 4 Kop postal card (N) with corner illustration. Celebrating 60 years of Soviet circus.
AVAILABLE AT $12
RUSSIA (1979) Karaganda circus. 5 Kop postal card (O) with corner illustration.
AVAILABLE AT $12
RUSSIA (1992) Circus clowns. 7 Kop postal card (O) with corner illustration.
AVAILABLE AT $10
SWITZERLAND (1993) Clown holding rose. Illustrated Telegram (O).
AVAILABLE AT $20
SWITZERLAND (1987) 3 elephants rampant. Illustrated cancel on envelope for 6th International Congress of Friends of the Circus.
U.S.A. (1862) Man* carrying bale of cotton* riding two horses simultaneously. Patriotic cover "John Bull's Feat of Horsemanship," a veritable circus scene! Roughly opened at right and very slightly reduced on left. Interesting reverse image of front cover on back. (Patriotic covers from the Civil War are considered historical documents and are generally admissible in International Philatelic Exhibitions). Scarce!
GERMANY (1969) Circus horse. Archive photo 
NEW CALEDONIA (1967c) Blue Harlequin shrimp. Trial color proof in brown. Noumea aquarium. Scott No 340, Yvert No 324.
BELGIUM (1990) Clown carrying double bass beside seashore. Illustrated Postogram (N).