Go to this site, it is great for finding lathes. I would bet yours is a Portass Lathe of some model, they made alot of them. Click on all the highlights in the text to see others that look similar to yours. So look around there, a good start...Bob
http://www.lathes.co.uk/portass/index.html
http://groups.yahoo.com/group/southbend10k/