Serial number stumper


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KingSized HD

Wore out three sets of tires already!
Feb 23, 2013
617
919
Herndon, CA, United States
#1
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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KingSized HD

Wore out three sets of tires already!
Feb 23, 2013
617
919
Herndon, CA, United States
#6
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.
 

Rivnut

Wore out three sets of tires already!
Nov 24, 2012
830
543
Shawnee, United States
#7
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"

schwinn-tubular-s7-26-wheels-chrome_1_9eb268732212a0c10aa5231a35ca0055.jpg
 

KingSized HD

Wore out three sets of tires already!
Feb 23, 2013
617
919
Herndon, CA, United States
#8
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.
 

Rivnut

Wore out three sets of tires already!
Nov 24, 2012
830
543
Shawnee, United States
#9
"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.
 

Scout Evans

Look Ma, No Hands!
Mar 4, 2017
88
159
62
#10
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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KingSized HD

Wore out three sets of tires already!
Feb 23, 2013
617
919
Herndon, CA, United States
#11
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.
Good eye! I realized that probably wasn’t stock when I broke it down @GTs58 confirmed it. Luckily I have a 3 Spd SA from a 50’s girls Tiger with S7s, hopefully the cable is long enough.
 

Scout Evans

Look Ma, No Hands!
Mar 4, 2017
88
159
62
#12
The cable from the Tiger should work, just run it on the lower frame like it's on the Tiger. The 57 catalog confirms it's a Corvette. As you suspected, no other 3 speed middleweight matches yours.
 
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KingSized HD

Wore out three sets of tires already!
Feb 23, 2013
617
919
Herndon, CA, United States
#13
Here’s the before & after. I couldn’t find the 3 spd Tiger wheel so I ditched the non-OG shifter/S-5s and used some parts (chainguard, sprocket, crank, wheels) from a ‘58 single speed ‘vette. I added the front brake from the Tiger so it wasn’t too plain. All cleaned & lubed it’s a nice rider, but paint & decals still show it was well loved. It still needs a front brace, but I don’t have a rivet tool so...
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Time to patina the ‘guard....
 

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