A 12 o'clock aperture on the Chyros BalancierVisible offers a glimpse inside the watch. The delicate balancier movement of the Eta 2824 TOP stands out against the stunning dials. The Swiss automatic movement is not only trustworthy but also beautifully adorned with blue screws, perlage, and Geneva stripes. You can even spot the LIMES logo on the rotor through the see-through case back. Movement: Eta 2824 TOP with Open Balance.