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Calendar week

1815 Kalenderwoche, a special model produced on the occasion of the 150th anniversary of Uhren Huber, Munich, at A. Lange & Söhne, with radial calendar week display on the outer rim of the dial
© A. Lange & Söhne

Unlike most other countries, Germany, for example, also often refers to the calendar week. It is the number of the week within the current year, i.e. from 1-52 or 53.

Only a few watch models display this value, including:

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