Tradition, and the more formal look it gives them.
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The numbers 1221 in Roman numerals is MCCXXI. Roman numerals is the numeric system that was used in ancient Rome and is still used on some clocks and watches.
Basically they are used to dignify and differentiate. For example, the cornerstone of a building many times has Roman numerals, the names of royalty have Roman numerals, such as Elizabeth II, some watches and clocks, especially grandfather clocks, many times Roman numerals are used in the introduction to books to differentiate them from the standard page numbers.
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There are a lot of clocks that have Roman numerals---not JUST churches. Originally it may have been a continuation of the archaic designs of sundials. Many clocks today have Roman numerals because it makes them look old and classy. Also some clocks with Roman Numerals will have the 4 written as "IV" and some as "IIII". This odd dichotomy has no firm explanation.
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