Can anyone help me with this underwater housing. It does not have a makers name so I dont even know who manufactured it. It has two openings in the base for wires to attach to two contacts at the back inside. Also there has been something mounted on the front just above the window, what for I dont know. Also comes with a bycycle pump which I assume is used to maintain pressure.It is metal construction, very heavy.

Hi everyone, some more photos.