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Fifty Fathoms watch
the FF was the brainchild of 2 French Naval officers charged with setting up an elite underwater unit. They determined the requirements, including watertight operation at the depth of 91 meters, the accepted maximum for untethered diving...which happens to be a pinch over fifty (6-foot) fathoms. Evidently they approached the powerful French watch firm, Lip with this project but were rejected, and so moved on to Blancpain who designed the watch (which was subsequently and somewhat ironically cobranded and distributed by Lip!). Over the decades the construction of the FF evolved and varied, sometimes considerably, to meet the requirements of each distinct customer. Like many other legendary models, there is no single representative Fifty Fathoms, any more than there is one Constellation, Calatrava or Reverso.