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Glossary of watchmaking

Roman numerals

Chiffres romains | ローマ数字/ローマスウジ | 罗马数字

Pocket watch with Arabic and Roman numerals

I, II, III, etc. Roman numerals have traditionally been used on clock and watch dials. IV is often given as IIII to create visual symmetry with the VIII. Only the IX is written using the subtractive principle.