HELP & QUESTIONS Vintage Herman Miller Eames RAR rocker

Here is one of my tresures from today out picking. A Vintage Herman Miller Eames RAR rocker. It's a little out of my scope of expertise. My questions are --- Is this a Zenith rocker? , what would be the approx. production year of this rocker? Is this the rarer color that they call Lemon - even though the interior of the shell is darker due to age & use - the underside is a lighter yellow color. Is It Right? I believe it is in very good & original condition other than the darker shell interior color & 1 bolt that has a defferent head - rockers seem right - frame is good - pads shocks etc. - If not please let me know it looks pretty original to me. But like i said - I need everyone's help on this - just beyond my knowledge of modern. Many Thanks in advance for your time & efforts. Below are the pictures of the rocker. Thanks Again. rbjr

NEW PICTURES... as requested

your chair looks fine to me ,these chairs are currently reedited by Vitra so a lot of people buy the new rocker bit and put it on an old shell too create a valuable old rocker chair your rocker seems to have some wear so probably old unless someone has artificially aged it