With Panerai box and certificate
The Mare Nostrum model has a number of different features from other Panerai models, lacking the cushion-shaped case and patented crown locking bridge, and featuring a tachometer scale on the bezel. Two other Mare Nostrum models were introduced during the Pre-Vendme period, both Slytech editions with the word "Slytech" on the dial. The ref. 5218-302 featured a tachometer scale on the bezel, and the ref. 5218-304 featured a smooth bezel and both were produced in a limited edition.
A total of 10 prototype examples were produced, and then 492 examples of the pre-Vendme model, and 63 Slytech models.
The model features a Dubois-Depraz 3127 chronograph module. Dubois-Depraz has been run by the family since it's opening in 1901, and produces modules that sit on base movements, and add additional functionality. They specialize in chronographs and calendar mechanisms, and many of the major luxury brands work with them.
The Mare Nostrum model is described and illustrated in The Panerai in Florence by Dino Zei.