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originally made for: Rothschild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.