help ! anyone an expert on the 80's please ?  

80s Chair
Nice and looks Italian but isn't Memphis-Milano. Any markings on the chair? Probably an 80s Post Modern influenced design made in Italy or U.S.. A lot of this type item was sold in Work Bench, Scan Interiors, Habitaire, etc. I'll check Italian design books and reply if I find anything similar.
http://www.flickr.com/photos/memphis-milano/

the (whimsical appendage arbitrally applied)
a sure sign of 80s design...likely a latter 80s design,a follow the trend not an earlier set the trends design.

It has a "Philippe Starck"...
It has a "Philippe Starck" look to it but if it isn't marked there's no way to know for certain.

I hope Philippe Starck isnt...
I hope Philippe Starck isnt a forum regular!

Could be a 90s knock-off of h...
Could be a 90s knock-off of his design style. Doesn't show on the Starck site or in any of my 80s design books.