1960s vintage "The Indiana" By Martin Elkhart Ind. The case is beat up but serviceable. The serial number on the neck matches the serial number on the body (75xxx). It is not a mint "Closet Queen" - it has dings, dents, some solder work and finish wear consistent with a 60+-year-old saxophone so it has a nice "patina" and cool graphics on the bell.
It will also need a few pads. Despite its age and aforementioned cosmetic flaws it is a solid horn with a lot of life left.