These are some great shots of the Daytona 200 made by Frank Scherschel of Time Magazine. The Daytona 200 was held on the beach from 1937 until 1960. Starting in 1961, they moved inland to the Daytona International Speedway. The date these pictures were taken is not listed, but based on the makes of the motorcycles, I would guess sometime in the late 40's or early 50's.
from riding vintage
