It should be soldered on, take a torch and heat the bracket up, you should see solder starting to ooze out..I just took all that stuff of a '36 radiator.
But why do you think it's beyond repair?
Edit:
The sides for the grill is soldered on as well...save it all if you have to take it apart....as well as the bottom piece...note you have to take out the petcocks before the bottom mount will come off.
2nd edit
:
The aftermarket radiators come with them on when I was looking for one a few years back.