Efficient Casting of Roman Numerals for Clocks

Using IIII rather than IV, the symbols on a 12-hour clock face with roman numerals number:

twenty Is
four Vs
four Xs

so a single mould

VIIIIIX

can be cast four times, with each casting cut twice, in order to make the correct number of numerals:

VIII — I — IX
VI — II — IIX
VII — III — X
V — IIII — IX

The IIX and one of the IXs are turned to form XII and XI.

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