Possible Finn Juhl chair?  

Not Finn Juhl.  American made. 

My first thought was a Kodawood chair by Seymour Wiener but I don't see any with arms like that.  I know they usually glued their tag under the seat near the front, like this.  Maybe check to see if there is any sign there was a tag on yours.  

@mark737

Seems as if someone had mounted the Kodawood backrest and seat on a different frame. But then the original drill holes should be visible on the back, and that's not the case. So either a real "never seen" Kodawood model, or a failed homemade one. Looks strange.

Hello,

I write you from Madrid, Spain. I 've found, literally in the street, a pair of Chairs. When I began to sand one of them I found the label of France and Son. 

I'm currently  investigating and I believe they're Finn Juhl Model 209, Diplomat Chairs.

Could anyone help me? 

I don't really know what to do, if they really are Finn Juhls...

There‘s not much to be done. Enjoy them. The diplomat series is Finn in his late period, they are nice chairs but not as valuable and sought as his Niels Vodder pieces. You can’t do much wrong. But if you have specific questions, don’t hesitate to ask.