The back story, from the Prof:

“The B-side is entirely different version from the one we know from Dylan’s 2nd album (recorded at the same session). This track not appear anywhere else other than this single. 

It’s a little bit more complicated with the A-side; there are no less than three different takes of this song in circulation. This is the original version as chosen by producer John Hammond and this single is pretty much the only place where you can hear the original mono version as prepared for release. The very same take appears in stereo on the revisited 1997 version of the ‘Biograph’ boxset but that version, with its wide stereo panorama, diminishes the strength of the song.

The 45 was first released in Dec. 1962 in the US only. It failed to do anything and sold in small numbers. Pretty soon, it was deleted. But with Dylan’s popularity on a height on the mid-60’s, the Dutch division of Columbia/CBS decided to re-release the 45 in an attractive photo sleeve (with a picture from the Highway 61 sessions) in late 1966. 

Read more here (scroll down to 3/4 of the page).”

(Get the high-fidelity files from Prof Stoned here on his site.)