Trying to identify brakes

The 69 Dart I bought a few months ago was originally a manual drum brake car all around, at some point it had the front swapped for a disk setup, don't like it much as they notched the lower control arm to give clearance to the brake hose, anyway here is a picture of some numbers on the caliper, haven't found anything from google, anybody able to tell what these are off of?

IMG_3872.JPG