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Housing the manufacture calibre CH 28-520 FUS, the 5990 combines a flyback chronograph with an instantaneous jumping second time zone and local time display — a technical achievement of considerable complexity. The flyback function allows the chronograph to be reset and restarted in a single pusher action rather than the conventional three-step sequence, a complication with roots in aviation timing instruments and long prized by collectors for its mechanical elegance. The instantaneous jumping GMT display, meanwhile, advances in discrete one-hour increments rather than crawling continuously — a finishing detail that speaks to Patek’s uncompromising approach to functional legibility. That these two demanding complications coexist within a case of just 40.5mm, without visual compromise to the iconic horizontally embossed dial, remains a feat of movement architecture that few manufactures could credibly attempt.

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