2nd generation Eames armchairs?  

I'm sorry to beat a dead horse as I'm sure it's been discussed. I searched previous threads with no luck 🙁

Hi guys and gals! Wanted to give you an honest thank you for all the awesomeness that goes on in these parts!! I'm sorry in advance as I'm sure "eames Id" threads have been created numorus times. :/

I recently picked up a pair of shell arm chairs in which I need a little help IDng. I originally bought them without much info/pics with the assumption they are the generation following the "rope edge" days. There is no Herman Miller logo as well as no Zenith sticker. Along with no residue from a old sticker. The odd thing is, is one of the chairs (the x-base) is a tad thicker than is Eiffel base counterpart. The fiberglass seems to be pretty much the same in both chairs. There is also more shine, sheen to the x-base chair along with a thicker edge. I do not see any rope edge tho, but is def thicker. I'm sure these can be easily identified/rough value to the talented peeps around here as I've only been interested in mid century design this past year. I've fallen in love and have been bitten by the bug!

So any help would be amazing! Thanks again everyone!!! Have a nice weekend!!
<img class="wpforoimg" src=" http://d1t1u890k7d3ys.cloudfront.net/cdn/f