I'm the Wiz, and nobody beats me!
Is the bike in your possession? Due to the mention of it being a 1952 model and then looking at the stem and bolt on stand, I'm betting that's a 1953. Schwinn repeated some 1952 serial numbers in 1953. The hole spacing for the large oval is 3-1/4 inches. The small ovals and the prewar badges have a spacing of 2-3/16 inches.