Today is the last day to bid on “Panerai: The Prototypes”, an exclusive online sale of three unique prototypes from the luxury Italian watchmaker. Pictured here is the prototype for one of Panerai’s rarest and most coveted watches: The Mare Nostrum. Developed for Italian Naval officers in the 1940s, the watch never made it into production at the time. Where modern Mare Nostrums have seen blue, brown or black dials, this prototype for the PAM00300 limited-edition released in 2010, is the sole model to feature the original olive-green dial and fabric strap. An icon of Panerai’s maritime roots, bolstered by modern innovations, this is a collectible of singular rarity (est. £20,000-30,000). The sale closes at 3pm (GMT time). Panerai #SothebysWatches #SothebysOnline #OfficinePanerai #Prototype #Watchprototype #prototypewatch #marenostrum #paneraimarenostrum