A quick Google search brought up some results for an "Aldens" sewing machine.
Is it possible that's an S and not an A at the end?
It's listed down a bit as a Singer look-a-like machine:
http://sewingmachine221sale.bizland....re/page19.html
A search on ALDENS brings up even more.
http://threadsofmine.blogspot.com/20...s-treadle.html