Looks to be a Quincy 210 pump. I'm pretty sure these are good specs on it.
210 is a single stage. With a 1 hp electric, 5.8 cubic feet displacement, 3.9 cubic feet free air, 90 - 100 Pounds pressure, 510 rpm. Or 1 1/2 hp electric, 9.2 displacement, 6.2 free, 90 - 100 psi, 810 rpm. Or 2 hp gas...