In honor of the brand’s origins as a travel-trunk manufacturer, the new Louis Vuitton Tambour Heures du Monde is equipped with a GMT function that lets a traveler track the time in two separate time zones. The watch’s satin-finished gray dial features an off-center subdial decorated with a map of the globe. Abbreviations of the names of 24 cities corresponding to different time zones—alternately printed in white and yellow for legibility—encircle the globe, with a yellow marker indicating the time zone current…