Mid Rocker identification

This chair is missing any markings from which I can identify. It was purchased at a flee market in Lansing, MI. We obviously have few great office furniture establishments in Michigan such as Herman Miller (Grand Rapids) and Steelcase (Holland), but I can't identify this one. It could be office, but my guess is no. It is a great rocker, no recline, with what I believe original fabric. Any help on this one? Wood is solid, no veneer but I am hesitant to call it walnut. It's color is oak, maybe a little darker. I can send more pics if anyone has an idea.. Thanks for looking!