This is a great example of the Wrenn W5015 "Hinchley" Chalk Ore Wagon in blue, running number 14. The bulk of the wagons were made by Wrenn, Basildon in Period 3 , however the issue in Period 4 was only during the year 1980.These examples are  Period 3/4 issued Wagons and have pin wheel axles and metal rimmed wheels. No other variations exist to the best of my knowledge.

Comes in a Period 3 (type 7.5p) or Period 4 (type W7304) box with yellow plastic insert.

Overall Condition is "near mint " considering age.