I've seen these before. This listing claims American made:
http://www.midmod-decor.com/product/set-of-dining-chairs-in-the-style-of...
... While Matt Blatt was a bit confused and thought they were knocking off a 108 chair. It's no longer available from them.
Another repro version called the Swedish Chair, sales site in the UK. I'm guessing both this and the Matt Blatt version came from the same factory in China.
http://www.retrofurnish.com/en/new-design/new-design-chairs/swedish-chai...
Still not sure why they chose this design to replicate.
And two more listings that describe them as Kagan style::
https://www.1stdibs.com/furniture/seating/dining-room-chairs/excellent-s...
https://www.1stdibs.com/furniture/seating/dining-room-chairs/set-of-six-...
The three vintage listings are from Philly, New Jersey, and New York, so if you are in that area, perhaps the original manufacturer was regional to that area as well.
If you need any help, please contact us at – info@designaddict.com