Made from a heavy casting alloy that will not rust or corrode. To achieve the raised lettering and a high relief motif each sign is individually cast using the traditional sand casting process. The foundry-men make a mould of the sign into which the molten metal is poured. After cooling, the mould is broken open and the sign removed. It is then cleaned, primed and stove enamelled. The last stage is the hand painting of the lettering and motif.