Unmarked brake. Help

A friend bought a 727 with this brake in it. No numbers or markings anywhere to be found so we do not know what it is. The solenoid has an out port on it that is a bit confusing as I have not ever seen this in a transmission.

That looks like an A1 T brake valve body that I have, at least the solenoid setup. Mine is low band apply as well. I can't say how well it works becauseI bought it new in box but very old and it didn't work lol. The trans brake would work but reverse wouldn't work, even with the brake on.

MY A&A ten years old had the same solenoid
gary