This is a superb example of the Wrenn W6001.A "Car No 87" Pullman Coach in Brown/Cream, with WHITE TABLES, and full B/B rosettes.  Although it is stated that just over 650 were produced in Period 4 by Basildon, you do not often see this White Table version, and I suspect the actual numbers produced were much smaller. This comes in a Period 4 (type W7304 box) with yellow cardboard insert.

Condition of the Pullman/box is "near mint" for their age.