Keller Extruded, Spring loaded Sash Lock.
Latch Fits the old style Single hung aluminum window.
The 9/16 diameter Spiral balance rod was covered in a gray plastic with a flat shoe that screwed into the bottom of the sash.
Priced and sold each.
This product is similar to or the same as the following part numbers in these brands:
Strybuc Industries: 50-626