Three apertures at 12 o'clock on the dial indicate the month, the date and the day of the week. Unlike perpetual calendars, annual calendars need to be corrected once a year at the end of February, and the new Portugieser Annual Calendar allows this to be

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Three apertures at 12 o'clock on the dial indicate the month, the date and the day of the week. Unlike perpetual calendars, annual calendars need to be corrected once a year at the end of February, and the new Portugieser Annual Calendar allows this to be

Three apertures at 12 o'clock on the dial indicate the month, the date and the day of the week. Unlike perpetual calendars, annual calendars need to be corrected once a year at the end of February, and the new Portugieser Annual Calendar allows this to be done conveniently using the crown.

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