That's one of the bad things about Sears, they let everybody build stuff for them. The prefix of the model number, 102, is supposed to allow reference to the OEM. The tank has a tag also, but a chase on that number hasn't helped either.
Kellog American would be good. I like their pumps. It's just been so long since I worked in repair machining, I can't tell by looking any more. Second shop I worked at did pneumatic/hydraulic repairs on the other end of the building, so we got the machine work out of all that.