thanks all, this razor was made by a friend of me in France, here is the link for his blog : http://www.ali-straight-razor.com/
And yes, all of his customs are great shavers,the blade keep the edge perfectly during the 3 passes shave and only need a couple of strops between 2 shaves
this is not my first one and probably not the last !
I wouldn't shave with anything else except my old W&B