Caliper location question

My disc brake calipers are located at the upper rear of the rotors. I read somewhere that 73+ disc brakes had the calipers located on the front side. Does this mean I have 72 or earlier disc brakes? Still trying to figure out what's what on this car.

Oh, and the hubs are BBP, if that makes a difference. This is a 73 car but with a 72 or earlier K-frame so it could be either one based on what was swapped out.