A maroon-tinted 5x7 transparency shows the Flood Building at the intersection of Powell and Market Streets in San Francisco. Cable car no. 503 is perpendicular to Powell Street on the turntable as pedestrians cross the street and travel the sidewalks. A sign on the roof of the cable car reads Powell & Mason Sts., and Municipal Railway is lettered on the side of the car. The Owl Drug Co.'s awnings and neon signs command attention on the right side of the photo. Handwritten on the envelope: Cable Car Turntable, SF.