Dairy Farmwife,
That is a recently made HA-1 / 15 clone. Perhaps India or China. It's a close copy of the Singer Mdl 15 with some embelishments.
You can get generic manuals for it at Sew-Classic and other places. They are very simple machines.
Here is a link to Singer of India and some of the machines they make:
{
http://www.singerindia.net/Straight_Stich.aspx?id=1 }
You can see they are clearly marked "Singer". That is why I do not believe the Kangaroo you have is a Singer.
Joe