looks almost identical to a set i saw recently on a t-bucket, they turned out to be motorcycle brakes. try looking around at bike stuff see if anything matches
It is hard to read the inscription on the caliper; maybe Superbell? As noted above, Wilwood has some calipers that are just about the same. If it has been sitting in a box for a long time, they might have come out of Magoo's shop. He sold several setups that were similar. Not much different from the JFZ setup that stopped my roadster for over twenty years. They will work fine on a light car.
picked up brakes today they were on a original 32 ford 5 window built in 1959 the guy has owned the car since then and in march it will be 50 years that he has owned the car he switched back to drum brakes