To make the illusion perfect, the edge of the discs is hidden by the circle of hours.

To make the illusion more realistic, the disc’s metal frame is hidden under the time scale circle.

Once at 6 o’clock, the dial engraved with Roman numerals VIII, IX, and X instantly turns into the display window to complete the hour operation.

Once at 6 o’clock, the dial engraved with Roman numerals VIII, IX, and X instantly turns into the display window to complete the hour operation.

Finally, the date according to the Gregorian calendar, associated with these indications, is read off the flange by means of a blued steel serpentine hand.