Yup that tag says it is a Mariner, single phase. Has a 230v, 7.5 hp motor and the final safety is set at 3500 psi. What it doesn't say is what filtration and options it has. If you are planning to run the unit at home, you may have starting issues with standard residential 230v, single phase. The 3rd (final) stage gauge line usually is connected at the pmv outlet, runs to the air pressure switch and continues on to the the gauge.
BTW, if they still have records from '95, you can give them the serial number and they can get you a manual for that exact unit. you'll have to pay for it of course. It will be an operators manual. Not sure if you can get a workshop manual.