I don't know either, but
yours is a bit overstuffed on the back. I've seen a bunch of these redone this way, probably because the upholsterer only knew the conventional way to do curves. Yours has a layer of batting that poufs up and obscures the curve; the button tufting was added to define the curve. The originals had a 1" (or so) layer of latex foam glued to the inside back and the fabric was glued directly to that. They also had an extra 1" to 1.5" of latex foam in the lumbar area and at the top to form a headrest. If you ever want to get yours redone for some reason, keep this in mind.
This one was unmarked, too. I've seen a bunch on 1st Dibs. I think some were attributed to Vodder but I've never seen proof of that.
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