This wagon is a standard RCH 7 Plank wagon (16ft 6ins x 8ft 0ins x 4ft 4ins) with side, end and top cupboard style doors. It was built by the Butterly Company in October 1924 and was part of a batch numbered 52-57. Interestingly it is lettered 'Richmond LSWR' although the London and South Western Railway had ceased to exist almost two years earlier.
Note that after 1940 PO wagons were repaired using unpainted planks and would
not have been seen in this condition in the 1950s and 1960s.