Hi,
thanks for your comment, I take it into consideration, this fact makes me suspicious indeed. But looking at the pictures of the samples available on the web it seems that the engravings varies from watch to watch so it's a bit disturbing. By the way, the font used, even if narrower, seems to be the same as the authentic known examples. I do not know what to think. Plus, as Mark pointed out, the rehaut is a "very hard to find" one, would it be interesting for the seller to make a dial redone, find this rehaut, a movement, faking the engravings etc.... I don't know
By the way, thanks to all for your help !