Montgomery Ward Riverside air compressor. The tag on the tank shows it was manufactured in 1967.
I do not know the tank capacity but the unit is floor mounted horizontally. Refer to the photo.
I have had it since 1971and was using it until last year when the drain line nipple broke off.
It has a 1-1/2 horsepower capacitor start dual voltage (115/230) motor, currently wired for 230V, but is easily changed for 115V
Pick up only. It can be plugged in so you can see it run.