This is a superb example of the Wrenn W.4658X B.R. "Prestwin" Silo Wagon in brown, running number B873000, from Wrenn, Basildon Period 4. It is rare to find these wagons in either short or long box versions today. Not to be confused with the most common Prestwins Fisons Silo wagon from Periods 2/3..

The Silo Wagon comes complete in a Period 4 Long Box version, with yellow plastic insert and yellow cardboard packing pieces (2)..

Overall Condition of Silo/box  "near mint " for their age. It has not seen layout use in my opinion.