Real? Knoll MR10 Side Chair by Mies van der Rohe  

I recently purchased a vintage MR10 style side chair. The chair has lost its manufacturer identification, however, I believe it's a genuine Knoll product.
I need help comparing other vintage Knoll MR10 side chairs with mine. I'm particularly interested in the welding techniques/assembly techniques behind the back leather strap/cushion because manufacturing techniques can often be an indicator of real and or fake products.
One image will show the welding technique behind the back leather strap/cushion. Another image will show where there was once 2 separate manufacturer tags/stickers.
I've included a link to my Tumblr blog containing more photos of the chair
Thank you for the help!
http://www.tumblr.com/blog/butterini
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