The car is represented as COX6004 by the seller who E mailed back to me.
From the Holy Graile vintage 1997 I quote:
" Vineyard Green/Beige interior. (a little faded huh?) Built by AC Cars to RHD specifications. 6004 was consigned on 11/13/63 to Lord Cross (Sussex, England) Cross raced the car, registered with the tag "4141 PE," and fitted it with widened flares, a full width roll bar, a hood scoop, and an
oil cooler/scoop. Although the car was raced with its original 6" wires, these eventually gave way to wider rims. 6004 was treated to a full restoration by Nick Green (ENG) in the early 80's, at which point the flares were widened further. The car has remained green with beige trim and has been equipped with a racing screen and Webers. An early round Cobra badge has been installed on the car's trunk just above the AC emblem."
Rick