saarinen base markings  

Krausfarm,
I have a set of side chairs with the same exact connections under the seat cushion as yours. They also do not have the markings discussed above, however, I am certain they are authentic. I bought them from the original owner along with the (marked) Knoll Saarinen table, and they were all purchased at the same time.

Staceyneil,
Thanks for the response. Yeah, I sent these photos to the store where the set (also with marked Saarinen table) was purchased, and they confirmed their authenticity.