This is the Wrenn W4665P "SAXA" Salt Wagon in Yellow, running number 248. Although earlier versions of the "SAXA" Salt wagon appeared in Period 1/2 (mainly orange), Yellow was only produced in Periods 3/4 and the majority issued in 3.This example is from the P4 build and is becoming rare to find today in this format.  As with all Period 4 Wagons it has metal rimmed wheels.

The Wagon comes complete with Period 4 (type W7304) box and yellow (type WA1) plastic insert.

Overall Condition is "near mint" for their age.