[SOG DIVER]

Most diving qualification cards indicate date and dive level along with issuing authority, like PADI-Professional Assn of Diving Instructors.
The training involved is not easy, but SCUBA or hard hat commercial diving is dangerous.
As a military combat dive school diver, a PADI card was issued. This also allows one to obtain air-for tanks. Most dive shops will not fill tanks-yours or theirs for use-without viewing your dive certification card.

A dive watch allows a diver to accurately measure elapsed time. There are other brands.
Diving without a Submariner on board is not for the skilled and/or intelligent.
That's why it always will be a tool watch. Forget Geneva and the boutiques.
Did a diver sell you your dive watch? Lt Col M