In the 1950s, Longines issued a series of timepieces made for Swissair. It was intended to be used by personnel of civilian flights, and had very specific characteristics. Beyond the pilot style (large, case, onion crown), they featured a 24-hour dial, intended to minimize the room for mistakes when crossing time zones as routinely happens to pilots. The back is engraved with the name of the company and the issue number (in this instance, 46). The fact that the watch was the result of a direct collaboration finds further confirmation on the fact that the Extract mentions that the watch was sold directly to Swissair, rather than to a distributor as it usually happens. Longines is not the only company to have been contacted by an airline to develop a watch during the 50s. This trend is a direct consequence of the fact that long range air travel was truly becoming relatively commonplace during those years with direct consequences also in the field of watchmaking, among many others.