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Perpetual Calendar Watches

RD821J movement

The RD821J calibre, a latest generation self-winding mechanical movement serving to display the day of the week and the month in two side-by-side apertures, along with the date, the moon phase and the leap year.
Front Back
Roger Dubuis Perpetual Calendar RD821J Front Roger Dubuis Perpetual Calendar RD821J Back
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Roger Dubuis Perpetual Calendar RD821J Front
Additional detail
RD821J perpetual calendar movement, 358 parts, 1,250 hours of manufacturing, including 380 hours devoted to the Hallmark of Geneva.
Parts364 pieces
Thickness5.28 mm
Size12 1/2'''
Frequency4.0 Hz
Power48.0 hr