lucifersum is a 100 percent correct on this one as that is the most recovered chair that we do , and i have looked at shells till i am blue in the face,
that is just a inventory code, that is on all chairs as a lot of the original were contracted out to two factories in the Michigan area including the Zeeland plant and the California plant,
AS of now they are out of the fiberglass business cause of green issues, as they are the number one green furniture company in the world,
and they contract to have the plastic shells made out of the Zeeland factory .
75 percent of the old chairs have a embossed name the others do not, to this day no one knows why, somewhere around the early 70s the embossed started to disappear.
tidbit...... the arm shell chairs on the bar are 1 inch smaller on each side , then the other chairs,
I never knew it till i saw it,on a set we did, the side shells are all the same size,