Yup - a Singer 24. It's a chain stitch machine.
What type of attachment does it have for feet? I've seen them with both side clamp and one that looks like a U and slips into a slot on the presser bar. Both can be bought aftermarket - finding originals can be difficult.
Singer made many modifications of these for commercial sewing (basic machine is the same). Yours looks like it may be one of the "special purpose" machines as it looks like there are some different parts on it. Even if the special parts aren't all there, I think you can still end up with a nice chainstitch machine.