Two complications that have no business fitting in the same case.
The 5990 does something Patek had not done before: it puts a flyback chronograph and a travel-time complication in one Nautilus case. Two pushers on the left move local time forward and back in one-hour steps, dragging the date with them; two apertures at 9 and 3 tell you at a glance whether you are reading local or home time.
The chronograph is a flyback, so a single press resets and restarts it without stopping first. The counters are laid out to keep the dial legible despite carrying two complications — which, on a 40.5 mm dial with Patek's horizontal embossing across it, is the hard part of the design rather than the movement.
In steel this is a reference that has never been easy to buy, and it tends to be held rather than traded. Tell us how firm you are on steel; the same watch exists in gold, and the timing is very different.
- Flyback chronograph with a 60-minute monocounter
- Second time zone with local and home apertures and a date that follows
- Calibre CH 28-520 C FUS, self-winding, with a gold rotor
- Pushers set local time in one-hour steps in both directions