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Serial number stumper

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KingSized HD

Wore out three sets of tires already!
Picked this one up yesterday. The chainguard is missing but based on the Stainless fenders, seatmast graphic and bow pedals I think it’s a 3 Spd Corvette. First catalog year for ‘vettes was 1955.

This bike has a serial stamped on the rear hanger of 7D18112 which, I think, would be sometime in 1957. But there’s also a bottom bracket stamp which appears factory to me of D5527Y. That dates to 8/19-28/1952 on the SchwinnCruisers tool. I realize that site isn’t always accurate so I’ll take it with a grain of salt but why would this frame have two stamps? And is ‘57 right for the 7D... rear hanger stamp?

Anyone have any ideas?
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In some areas or cities,the registration number was stamped under the crank. In my hometown it was done that way.
Yep, I thought the BB stamp might be a Police Dept or License number but it just looked so deep I thought it might be a factory stamping. I think everyone is right about it not being Schwinn.

Thanks for all the input everyone.
 
Definitely a Schwinn. Look at the tires and see what size they are. I'm betting a close inspection of the wheels would also reveal that they're stamped "Schwinn Tubular S-7"

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Definitely a Schwinn. Look at the tires and see what size they are. I'm betting a close inspection of the wheels would also reveal that they're stamped "Schwinn Tubular S-7"

Oh yeah, it's definitely a Schwinn bike, I just wasn't sure if the bottom bracket stamping was done by Schwinn or not.
 
"It" referring to the stamping, not the bike. Got it. That's one reason that I don't like prounouns; they're either misused or misunderstood.
 
It has a Shimano 3 speed, should be a Sturmey Archer. The wheels look 26 x 1 3/8ths, the S-7's were probably swapped out for skinnier wheels.
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