Looks like an earlier Singer model 237. I say earlier because it does not have the feed dog drop knob.
I have (had) two 237's with the feed dog drop. I gave one to my son and my Sis has 'borrowed' the other. I am on the lookout for another one.
I like them. They are all metal. Strong machines but in no way would I call it an industrial machine.
$55? I got my last one for $20 in a portable case.