Launched in 2019, the Patek Philippe Alarm Travel Time was a novel concept for the manufacture and took on the design codes and aesthetics of the beloved reference 5524G. Patek Philippe’s Calatrava Pilot Travel Time took its inspiration from early 20th century air travel pioneers and the brand's early aviation watches. While originally met with a lukewarm reception - like many models that today have become icons - it has today become a design classic and a stalwart in Patek Philippe's catalog. Its even more sophisticated sibling, the reference 5520P, was released in Patek Philippe's Grand Complication catalog, meaning that the timepiece was only available to Patek Philippe's most eligible and high end clients.

Based on the original Travel Time model, the reference 5520P was equipped with a 24-hour alarm with a hammer that strikes on a classic gong, along with the digital display of the alarm time. Moreover, the model was fitted with the newly developed caliber AL 30-660 S C FUS movement that features four patents. With four individual crowns, the reference 5520 is indeed an impressive beast, showcasing Patek Philippe's abilities in the research and development of new complications and models.

With a black dial and luminous markers that recall the vintage Pilot watches of the second half of the century, the case is notably crafted in platinum - a noble detail fitting with the watch's sophisticated complications.

So rare and well-guarded is this model that only three examples including the present watch have appeared at auction thus far. The present watch is preserved in excellent condition with crisp hallmarks beneath the lugs. It is furthermore accompanied by its Patek Philippe Certificate of Origin dated October 15, 2021, portfolio photograph, product literature, setting pin, presentation box and outer packaging.