Thanks all for those informations.
This is not the Shinji Eshima double bass, he bought another bass which belonged to Achille Gouffé (and David Walter!), there is a similar signature on the rib, but it is the name Plumerel on it. The shape is different and it is not a man head scroll.
He told his story here :
http://www.relentlessenergy.com/feat...uble-bass.html
I bought mine at a luthier shop in Tokyo. I believe that this luthier bought it at David Gage shop.