A17847. Also it has painted striped wheels instead of chrome.
Your bike is a 1953 Schwinn Deluxe Spitfire built on 8/18/1953. It's a really nice bike and one that is not often seen. @GTs58 makes a good point regarding the transition from 1"pitch to 1/2" pitch. Given the birthday of your bike, it is altogether reasonable to say that you sprocket is original. The rims are perfect. Below, please find the catalog cut for your bike. The Standard model had neither the rack, the truss rods, the tank, nor the Torpedo headlight.
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