Early Eames side chair?  

I have a fiberglass side chair that is odd enough for me to post some pictures and let some knowledgeable people weigh in (if you would like). I bought if for next to nothing for the chair tips for another project, but it has started to intrigue me. First off I read the early Eames side chairs developed cracks at the base and back, well this chair has those. I wouldn't have thought anymore about it since there was literally no marking of any type on the chair.

Until that is, I removed the legs. A small upside down S (Zenith?) and three dots in a straight line (3M?) appeared near one of the mounts.

Is any of this meaningful? I can supply more photos (can only load one per post?) , but am realistic that this is probably my imagination.