Both of those hacksaws have a 90% chance of being butcher saws. Their blades were available by the roll, and blade punches dold to make them to length needed.
236 p., illus., 22.7 cm, trade catalog
archive.org
236 p., illus., 22.7 cm, trade catalog
archive.org
I use SS bandsaw blades to turn them into hacksaws.
There are also some out there that seemed to belong to a rental type agency, stamped NOT TO BE SOLD, and apparently were resharpened by the owner. Blades thick at the end, then tapering erratically a bit, skinny in the middle.