Here's the details from the instrument file:

top: Walnut
body: Mahogany
neck: Maple, Purpleheart, and Beech
scale: 32" medium
fingerboard: Rosewood
inlays: mother of pearl
peghead veneers: Zebrawood
originally made for: Rothschild

It had at least two owners before you, and both are in the Alembic Club.

Walnut can get a good bit lighter over time - this looks like it sure did.

Thank You, Mica. 

Indeed it is a pale, more orange-colored walnut.

A beech central neck laminate... interesting! Like, anti-ebony.    (well, not really, but it probably does help explain the unusually warmer, woody tone of this one)