On Fri, 13 Jun 2008 22:06:20 -0500, with neither quill nor qualm,
Ignoramus29659 quickly quoth:

Condition is compltely unknown but it is hard to go wrong for $25.

The guy said, true or not, that he could not figure out how to wire
it. He said it may have been 3 phase.

http://igor.chudov.com/projects/Champion-Compressor/

The motor tag says 5hp 250V 60Hz 25A 1PH.
Good snag.

--
Besides the noble art of getting things done, there is a nobler art of
leaving things undone. The wisdom of life consists in the elimination
of nonessentials. -- Lin Yutang