MH- I have to take issue with " would work far better if replaced". Excepting the change to max pad reach on that side of the caliper the function of this arm is the same as it was prior to the incident. I have broken a few caliper arms (including from the opposing ends of the failure spectrum, Berilla and Campy) as well as touched many thousands of brakes from every brand you can think of.

The classic bent caliper is the front whose cable stop arm extension has contacted the down tube and been bent forward. In the extreme that arm rocks/bends about the center bolt and/or the bolt bends too. These are fairly easy to straighten either with an adjustable wrench or a hammer. Center bolts are clamped in a vise and a punch and hammer do a good job at straightening the bolt. Of the many calipers I have straightened very few failed, like count on one hand few. Still I would not try correcting the imaged type of bend unless it prevented the brake function, which I doubt it will.

I suspect the caliper you have was run into a door frame or some such iten that just cleared the ft wheel. Note that the pads are likely not OEM. I don't remember these calipers coming with pad shoes with both the extra "schwinn like" anti pad slide out backwards shoe layer as well as the tire guides on the pad shoes. Even the pad's "dots" don't look to be of the era that these brakes generally came from. I stronglt suspect the pads have been replaced after the arm was bent. Andy