I seem to remember the "S" was some kind of proof/check mark (?). I know it has been discussed before, but can't remember which thread.
My C8 also has an "S" on the chassis, but I think my font is slightly different.
Good progress Jacek! What a coincidence....I also put a first coat of primer on my cab frame, last weekend!
Alex
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Chevrolet C8 cab 11 FFW
BSA Folding Bicycle
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