The veneer was usually Walnut. On the original style of LED installation, there were two veneers, typically Maple and Walnut or Maple and Purpleheart.
This was termed sacrificial veneer and it was intended to make future (and inevitable) repairs easier. We stopped doing it I think in about 1999 or 2000, as we improved techniques for removing fingerboards, and the clean look of the Ebony right to the edge of the neck was, well, cleaner! It also allows for the fingerboard to be thicker by the thickness of the veneer.