Miscellaneous Accessory Series Coal Sacks Stacked Pair
The MAS series contains what would be known in Film/Stage/TV circles as 'set dressing' - smaller items added to the overall scene to give it character by adding details of an appropriate locale and period.
Since coal was a staple commodity used by nearly every household in the country, its distribution was officialy regulated: the sacks had metal badges rivetted on to confirm they were of the correct capacity, and they were reused until they wore out. Full sacks were habitually stacked two high, both in the yards and on delivery carts or lorries.