It's a Powerex, which is a susidary company of Campbell-Hausfeld.
If it's 5HP they came in two flavors; single stage two cylinder V and two stage. The single stage V puts out approximately 16 CFM @ 90 PSI. Not sure of the two stage output. The one in the photo looks like it's a 60 gallon single V. Notice the pilot valve to the left of the 1/4" T fitting? The pump has valve unloaders, meaning that the pump will turn off and on while the motor runs continuously. The pump was made in Japan. It's aluminum with cast sleeves. These were medical grade pumps with extremely low oil pass through.
I have a vertical 60 gallon vertical, single stage V.
Yea, they're decent compressors.