The Panerai Mare Nostrum chronograph is one of the most enigmatic timepieces in vintage watch collecting: a massive 52mm bi-compax chronograph shrouded in mystery and conflicting evidence.
According to the official narrative, Panerai developed the Mare Nostrum in 1943 for deck officers of the Italian Navy. The story goes that only prototypes were created before the chaos of World War II halted production. For decades, the only proof of its existence was a single photographic plate from the 1950s showing the watch in a three-quarter view.
But the evidence tells a different story.
When you compare the Mare Nostrum's case design to other Panerai instruments, something doesn't add up. Early compasses from 1940 and 1944 show completely different design language. However, when placed alongside Panerai depth gauges produced from 1955 onward, the similarities are striking: the lugs have the exact same shape, and the areas between them match perfectly. The design clearly belongs to the 1950s, not the 1940s.
The plot thickened in 2005 when a Mare Nostrum prototype suddenly appeared at a Christie's auction in Geneva. After authentication by renowned experts, Angelo Bonati, CEO of Richemont Panerai, purchased it for 132,000 Swiss Francs. The watch now resides in the Panerai Museum.
But here's where things get truly bizarre: the prototype's case back is nearly identical to the 1993 replica that Panerai created, despite the fact that designers of that replica had no way of knowing what the original's back looked like. They were working solely from that three-quarter view photograph, which showed only the front and side. The odds of accidentally recreating such specific details, the convex shape around the case back, the slotted tightening method, seem impossibly slim.
What are we left with? A watch whose design suggests 1950s origins despite claims of 1943 development, and a prototype whose case back mysteriously matches a 1990s interpretation made without knowledge of the original. The Mare Nostrum remains as mysterious as ever, a beautiful enigma that raises more questions than it answers.
