The Mako Shark was an underwater 620 camera made by Healthways in USA in 1957.
The body is a plastic cylinder with a sports finder at the top, a large handle on the user’s left and a hinged front. It is equipped with valve to allow pressurising the interior to ensure good sealing, allowing it to operate to depths of 40m. There are some ballast lead weights built in. Single speed shutter (~1/55s) with an f16 fixed-focus lens set to a depth-of-field of around 1-2.5m.