Urban Jürgensen UJ-3 puts an instantaneous perpetual calendar around a natural escapement

The UJ-3 arranges its calendar around an off-centre time display, combining separate day and month windows with a date ring around the small seconds. A moon display occupies the opposite side of the dial. In the rose-gold version, pale hands and borders contrast with black guilloché surfaces.

Developed with Andreas Strehler, the integrated perpetual-calendar movement uses Urban Jürgensen’s double-wheel natural escapement. Calendar and moon indications jump instantaneously at midnight, while the leap-year indication sits on the movement side. The manually wound calibre provides 52 hours of reserve. Its 39 mm case is 13.9 mm thick and water-resistant to 30 metres; sapphire reveals the hand-finished bridges beneath.