rms37 said:prewar frame would have ears on the dropouts for drop stand stops
It's entirely possible the rims were swapped along with the sprocket at some point. Many postwar Roady's had rims with a slight bead right on the outside corners. Columbias tended to have square edged rims. What kind of coaster brake is it? If it's a Bendix red band, the rim is 1963 or later. I agree with Phil on the frame though, I know he's the Cleveland Welding expert 'round these parts! ~Adammy LBS was working on the hub and said it was a Columbia....