This watch model is rarer, and larger, has the back of the lid showing signs of use, otherwise it is wonderful given its time.

Cortebert Special pocket caliber 616, working perfectly.
No papers, no box originals.

It is as seen in the photos.
.Seeing as is.

This caliber 616 was used in the original Panerai workshop diving watch supplied to the Italian navy. These watches used the Rolex caliber 618, which was actually a Cortebert 616 supplied to Rolex.