The wombs are here. (Well, there)
I picked up the womb chairs from the auction today, and they are being stored in a friend's extra bedroom because my apartment is on the market.
The orange one is bleached almost white in some areas and is mostly pale peach. The fabric is orange hopsack with bright green flecks, I am guessing 60s. It may be a reupholstery, the bottom is not done in Knoll fashion.
The brown one is as hard as a rock. Picking up the cushions is like picking up a sack of lumpy baseballs. The back cushion is it's ottoman cushion, I think. I am saying 1950s latest on this one based upon fabric.