Nice machine.
According to ISMACS {
http://www.ismacs.net/singer_sewing_...ist/index.html },
data page {
http://www.ismacs.net/singer_sewing_...s-100-199.html },
it is a domestic ZZ machine, made in Brazil, and it uses the 15x1 needles. Made from 1970 to 1974.
I like it. I can be treadled too.
Joe