Go to Yahoo groups and join the vintage japanese sewing machine group. They have some manuals there. I have a straight-stitch, pink Atlas which is a rebadged HA4-B2 Brother and found a manual there. The manual for mine actually says "Sovereign" on the cover. A lot of vintage machines were made in Japan and re-labeled for sales in the US.
Look for HA4-B2 Brother in the files section. Go through the manual and see if its features match you machine.
http://groups.yahoo.com/group/vintag...ewingmachines/
Tate