The vast majority of letter boxes are produced in cast iron by foundries. Nevertheless, years gone by have seen numerous different materials put to use in producing letter boxes.
Sheet steel was used for a range of boxes, but was found not to weather very well. Wood can be found on many boxes, particularly at smaller local Post Offices where a box has been made to local requirements. In the past boxes have utilised concrete either for construction or modifications. One type of letter box even used enamel for a part of its facade and can still be seen on the streets of Britain today.
More recently, varying forms of plastic have been used in the production of letter boxes, often for siting indoors in shopping centres and other similar locations.
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