Shot on the Cole Bros. Circus in the 1940s. At about the six minute mark they begin to feature the clowns. I believe Horace Laird is misidentified at "Otto", Otto Griebling is misidentified as "Mike" and Mark Anthony is correctly identified as "Tony".
In the background there may be Art Cooksey and Bobby Kay. If someone could ID them for certain we'd have a better idea of when this footage was shot.