Resources for Speedway Special needed

[Archie Sturmer]

Need some help with the the make and serial number on this Speedway Special. Can anyone confirm the make and year? Thank you!

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Purely extrapolating, maybe 1931–F Shelby?

Shelby-badged Serial Numbers-Prewar | Classic Balloon Tire Bicycles 1933-1965

Want to re-visit early Shelby serial numbers. No-one seems to be boiling them down pre-war as of yet. Maybe not possible?... It would be great Shawn if someone can help with this project, similar to the Colson serial number thread by @fordmike65 . Badged (unremoved) bikes are needed with...

thecabe.com

 

[Archie Sturmer]

Maybe additional pictures of some more details might be helpful, not sure where to find a similar 26” juvenile Shelby from the late 1920’s to compare, (e.g., for differences?).

For example, Shelby may have used narrower headset cups, or a straight seat stay bridge.
Shelby may have used alphabet letter prefixes for serial numbers during different years of manufacture; or may have used 5-digit serial numbers in the time frame that production had not yet reached 100,000. Shelby may have used 1/4” x 26-tpi chain tensioner screws (vs. 24-tpi).