Okay - I think I just answered my own question.
I found an old P22 typewriter font that shows a 1 similar to that on the Aussie BC (missing the _ at the bottom) but has a lower case l that matches everything else.
http://www.fonts.com/FindFonts/Detail.htm?pid=4345298&/cgi-bin/MsmGo.exe?grab_id=0&page_id=53804&query=TYPEWRITER&SCOPE=Fonts
nice find....