The annual calendar shows the day, date and month, needing to be corrected only at the end of February. For its Rotonde de Cartier Annual Calendar, the Maison used a mechanism integrated in the plate of the calibre 1904 MC (291 components, 32 jewels, 28,800 vibrations per hour, 48-hour power reserve), a self-winding mechanical movement. On the dial, the indications are arranged as follows: double date window at 12 o'clock, day window around 6 o'clock, and month around the perimeter of the dial, via a red indicator. The 40-millimetre case is made of 18-carat rose gold (it is also available in white gold) and is fitted with an upper and lower sapphire crystal. It should be emphasised that all indications are corrected via the crown alone, without the aid, therefore, of any additional push-button.
