Girard Perregeaux 'Gyromatic' steel cased wristwatch with baton numerals, date window and original bracelet and buckle, 1.46 in. wide including crown
- Date Aperture - A date aperture is a cut out section in the face of a watch or clock, displaying the day of the month.
- Baton Numerals - A watch that instead of displaying numerals on the face, displays a marker in the form of a baton, or lower case letter "L". Since the baton-like marks are not numerals, the feature is also called baton markers, baton indexes and baton indicators.
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