Applescript to open Get Info box for the previous iTunes track?
You can in a round about way using the "Recently Played" playlist. 

You configure it the way you want, I've set it to the 5 most recent items,  and then run this code...

tell application "iTunes"
    set rp to get playlist "Recently Played"
    #get name of every track of rp
    #get name of last track of rp
    #set tid to get id of last track of rp
    reveal track 5 of rp

    activate

    tell application "System Events"
        tell process "iTunes"
            key code 34 using command down
        end tell
    end tell        
end tell


Hope this helped.

EDIT: This only works with songs that are fully played. Partially played tracks will not show up in the "Recently Played".