I found this alembic epic (serial num : 1997), there's no B string but ...
Is there some one who know this one or have information on it.
Thank you.

Hi Pierre;
 
1997 is not the full serial number.  You'll need to get the entire serial number.  When you do, post it to the section of the board so that Mica will see it when she gets some time to look up serial numbers.
 
From the picture, the top is Zebrawood, there appears to be a Maple accent body laminate, and the body appears to be Mahogany.  It appears to have standard Epic electronics, which are described here.  Being an Epic, it most likely has a three piece Maple set neck with Walnut accent veneers and an Ebony fingerboard.
 
Hope that helps.

You're right, i make the mistake, the serial number is : 97W10754USA
Thank you for your answer