A WEC includes a non-circular main central column positioned within a like non-circular central opening of a shell to contain the central column and prevent rotation or twisting of the shell relative to the column. A pattern of pits or data indentations forms the visual design. The printable surface further includes a printed data field specified substantially within the printable surface, including machine-readable marks of digital data encoding a service code and a user identification number; and a printed rectilinear border surrounding the printed data field to define a rectilinear iconic representation. The financial institution saves resources by retaining individual loyal to the financial institution with larger account amounts and then uses this savings to invest into an account that will increase in value over time so as to provide the individual with greater assets in the future. The present device includes at least one guard strip, for reducing the resistance of the guard, the guard strip being arranged within the access area and connected to the active guard and to the metal connector, the latter being connected to the electrode plane such that the conductor plane and the electrode plane are at substantially the same potential. A method of manufacturing a dual hard steel article comprises providing a first air hardenable steel alloy part comprising a first mating surface and having a first part hardness, and providing a second air hardenable steel alloy part comprising a second mating surface and having a second part hardness.